# PUBLICATIONS

*(By CEMMETU Members Since 16 May 2013)*

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**Journal Papers**

[1] B. Karaosmanoglu and Ö. Ergül, “Modified combined tangential formulation for stable and accurate analysis of plasmonic structures,” ACES Exp., vol. 34, no. 5, pp. 811–814, May 2019.

[2] B. Karaosmanoglu, E. Tuygar, U. Topçuoglu, and Ö. Ergül, “Improving the efficiency of solar cells using antenna-inspired cavities,” Microw. Opt. Technol. Lett., vol. 61, no. 8, pp. 1924–1930, Aug. 2019.

[3] B. Khalichi, Ö. Ergül, and V. B. Ertürk, Broadband solutions of potential integral equations with NSPWMLFMA,” IEEE Trans. Antennas Propag., vol. 67, no. 6, pp. 4307–4312, Jun. 2019.

[4] A. Farshkaran and Ö. Ergül, “Implementation of the equivalence principle algorithm for potential integral equations,” IEEE Trans. Antennas Propag., vol. 67, no. 5, pp. 3249–3255, May 2019.

[5] A. Altınoklu and Ö. Ergül, “Design and optimization of two-dimensional nano-arrays for directive radiation,” ACES J., vol. 34, no. 2, pp. 347–351, Feb. 2019.

[6] A. Altınoklu and Ö. Ergül, “Nano-optical couplers for efficient power transmission along sharply bended nanowires,” ACES J., vol. 34, no. 2, pp. 228–233, Feb. 2019.

[7] G. Isıklar, İ. C. Çetin, M. Algun, and Ö. Ergül, “Design and analysis of nanoantenna arrays for imaging and sensing applications at optical frequencies,” Advanced Electromagnetics, vol. 8, no. 2, pp. 18–27, Feb. 2019.

[8] E. Çetin, M. B. Sahin, and Ö. Ergül, “Numerical study of chipless tags for radio-frequency-identification (RFID) applications,” Advanced Electromagnetics, vol. 8, no. 2, pp. 10–17, Feb. 2019.

[9] M. Kalfa, Ö. Ergül, and V. B. Ertürk, “Error control of multiple-precision MLFMA,” IEEE Trans. Antennas Propag. , vol. 66, no. 10, pp. 5651–5656, Oct. 2018.

[10] B. Karaosmanoğlu, H. Eray, and Ö. Ergül, “Full-wave optimization of three-dimensional photonic-crystal structures involving dielectric rods,” J. Opt. Soc. Am. A., vol. 37, no. 7, 1103–1113, Jul. 2018.

[11] Ş. Yazar, C. G. Sür, B. Solak, Ö. Eroğlu, A. Altınoklu, S. Güler, U. M. Gür, B. Karaosmanoğlu, and Ö. Ergül, “Efficient and accurate electromagnetic analysis of three-dimensional nano-optical structures,” Materials Science Forum, vol. 915, pp. 202–206, Mar. 2018.

[12] G. Karaova, A. Altınoklu, and Ö. Ergül, “Full-wave electromagnetic optimisation of corrugated metallic reflectors using a multigrid approach,” Sci. Rep., vol. 8, no. 1267, Jan. 2018.

[13] H. İbili, B. Karaosmanoğlu, and Ö. Ergül, “Demonstration of negative refractive index with low-cost inkjet-printed microwave metamaterials,” Microw. Opt. Technol. Lett., vol. 60, no. 1, pp. 187–191, Jan. 2018.

[14] C. Önol, A. Üçüncü, and Ö. Ergül, “Efficient multilayer iterative solutions of electromagnetic problems using approximate forms of the multilevel fast multipole algorithm,” IEEE Antennas Wireless Propag. Lett., vol. 16, pp. 3253–3256, 2017.

[15] F. Mutlu, C. Önol, B. Karaosmanoğlu, and Ö. Ergül, “Inkjet-printed cage-dipole antennas for radio-frequency applications,” IET Microwaves, Antennas & Propagation, vol. 11, no. 14, pp. 2016–2020, Nov. 2017.

[16] B. Karaosmanoğlu, S. Küçük, and Ö. Ergül, “Fine-tuning snowflake fractal antennas,” Int. J. Numer. Model., vol. 30, no. 6, e2212, Nov./Dec. 2017.

[17] U. M. Gür and Ö. Ergül, “Accuracy of sources and near-zone fields when using potential integral equations at low frequencies,” IEEE Antennas Wireless Propag. Lett., vol. 16, pp. 2783–2786, 2017.

[18] M. Takrimi, Ö. Ergül, and V. B. Ertürk, “Incomplete-leaf multilevel fast multipole algorithm for multiscale penetrable objects formulated with volume integral equations,” IEEE Trans. Antennas Propag., vol. 65, no. 9, pp. 4914–4918, Sept. 2017.

[19] Y. E. Tunçyürek, B. Karaosmanoğlu, and Ö. Ergül, “Computational design of optical couplers for bended nanowire transmission lines,” ACES J., vol. 32, no. 7, pp. 562–568, Jul. 2017.

[20] B. Karaosmanoğlu, A. Yılmaz, and Ö. Ergül, “A comparative study of surface integral equations for accurate and efficient analysis of plasmonic structures,” IEEE Trans. Antennas Propag., vol. 65, no. 6, pp. 3049–3057, Jun. 2017.

[21] B. Karaosmanoğlu and Ö. Ergül, “Generalized hybrid surface integral equations for finite periodic perfectly conducting objects,” IEEE Antennas Wireless Propag. Lett., vol. 16, pp. 1068–1071, 2017.

[22] B. Karaosmanoğlu and Ö. Ergül, “EFIE-tuned testing functions for MFIE and CFIE,” IEEE Antennas Wireless Propag. Lett., vol. 16, pp. 968–970, 2017.

[23] A. Altınoklu, B. Karaosmanoğlu, and Ö. Ergül, “Electromagnetic optimizations of corrugated metallic sheets for maximum power focusing,” J. Electromagn. Waves Appl., vol. 31, no. 8, pp. 837–849, Apr. 2017.

[24] S. Güler, B. Karaosmanoğlu, and Ö. Ergül, “Design, simulation, and fabrication of a novel type of inkjet-printed pixel antennas,” PIER Lett., vol. 64, pp. 51–55, Nov. 2016.

[25] B. Karaosmanoğlu, A. Altınoklu, and Ö. Ergül, “Numerical constructions of testing functions for improving the accuracy of MFIE and CFIE,” Prog. Electromagn. Res. M, vol. 51, pp. 63–70, Oct. 2016.

[26] C. Önol, S. Alkış, Ö. Gökçe, and Ö. Ergül, “Multi-frequency and multi-direction optimizations of antenna arrays using heuristic algorithms and the multilevel fast multipole algorithm,” Radio Sci., vol. 51, no. 7, pp. 1094–1108, Jul. 2016.

[27] M. Takrimi, Ö. Ergül, and V. B. Ertürk, “A novel broadband multilevel fast multipole algorithm with incomplete-leaf tree structures for multiscale electromagnetic problems,” IEEE Trans. Antennas Propag., vol. 64, no. 6, pp. 2445–2456, Jun. 2016.

[28] B. Karaosmanoğlu, A. Yılmaz, U. M. Gür, and Ö. Ergül, “Solutions of plasmonic structures using the multilevel fast multipole algorithm,” Special Issue on Challenges in RF and Microwave Defense Engineering, Int. J. RF Microwave Comput.-Aided. Eng., vol. 26, no. 4, pp. 335–341, May 2016.

[29] C. Önol, B. Karaosmanoğlu, and Ö. Ergül, “Efficient and accurate electromagnetic optimizations based on approximate forms of the multilevel fast multipole algorithm,” IEEE Antennas Wireless Propag. Lett., vol. 15, pp. 1113–1115, Apr. 2016.

[30] A. E. Ofluoğlu, T. Çiftçi, and Ö. Ergül, “Magnetic-field integral equation,” IEEE Antennas Propag. Mag., vol. 57, no. 4, pp. 134–142, Aug. 2015.

[31] Ö. Ergül and B. Karaosmanoğlu, “Broadband multilevel fast multipole algorithm based on an approximate diagonalization of the Green’s function,” IEEE Trans. Antennas Propag., vol. 63, no. 7, pp. 3035–3041, Jul. 2015.

[32] A. Yılmaz, B. Karaosmanoğlu, and Ö. Ergül, “Computational electromagnetic analysis of deformed nanowires using the multilevel fast multipole algorithm,” Sci. Rep., vol. 5, no. 8469, Feb. 2015.

[33] C. Önol and Ö. Ergül, “Optimizations of patch antenna arrays using genetic algorithms supported by the multilevel fast multipole algorithm,” Radioengineering, vol. 23, no. 4, pp. 1005–1014, Dec. 2014.

[34] Ö. Ergül and B. Karaosmanoğlu, “Approximate stable diagonalization of the Green’s function for low frequencies,” IEEE Antennas Wireless Propag. Lett., vol. 13, pp. 1054–1056, 2014.

[35] Ö. Ergül and B. Karaosmanoğlu, “Low-frequency fast multipole method based on multiple-precision arithmetic,” IEEE Antennas Wireless Propag. Lett., vol. 13, pp. 975–978, 2014.

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**Unpublished Arxiv Papers**

[1] U. M. Gür and Ö. Ergül, “Solutions of new potential integral equations using MLFMA based on the approximate stable diagonalization,” arXiv:1806.04164, Jun. 2018.

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**Books**

[1] Ö. Ergül, Introduction to Electrical Circuit Analysis. Wiley, 2017.

[2] Ö. Ergül and L. Gürel, The Multilevel Fast Multipole Algorithm (MLFMA) for Solving Large-Scale Computational Electromagnetics Problems. Wiley-IEEE, 2014.

[3] Ö. Ergül, Guide to Programming and Algorithms Using R. London: Springer, 2013.

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**Book Chapters**

[1] H. Aykut Şatana, B. Karaosmanoğlu, and Ö. Ergül, “A comparative study of nanowire arrays for maximum power transmission,” in Nanowires, K. Maaz, Ed. InTech, 2017, pp. 233–253.

[2] A. Çekinmez, B. Karaosmanoğlu, and Ö. Ergül, “Integral-equation formulations of plasmonic problems in the visible spectrum and beyond,” in Dynamical Systems – Analytical and Computational Techniques, M. Reyhanoglu, Ed. InTech, 2017, pp. 191–214.

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**International Conference Papers**

[1] G. Işıklar and Ö. Ergül, “Computational analysis of nanoantenna arrays for nanoparticle detection,” in Proc. Int. Conf. on. Microwaves, Communications, Antennas, and Electronic Systems (IEEE COMCAS), 2019.

[2] Y. Koyaz, H. Ibili, B. Karaosmanoglu, and Ö. Ergül, “Analysis of composite structures involving near-zero-index materials,” in Proc. Int. Conf. on. Microwaves, Communications, Antennas, and Electronic Systems (IEEE COMCAS), 2019.

[3] S. Güler, H. İbili, and Ö. Ergül, “MFIE-based formulation using double-layer modeling for perfectly conducting objects,” in Proc. Int. Conf. on. Microwaves, Communications, Antennas, and Electronic Systems (IEEE COMCAS), 2019.

[4] B. Karaosmanoglu, Y. Koyaz, H. İbili, and Ö. Ergül, “Fast and accurate analysis of three-dimensional structures involving near-zero-index materials,” in Proc. Int. Conf. on Electromagnetics in Advanced Applications (ICEAA), 2019, 1019–1024.

[5] A. Altınoklu, G. Karaova, and Ö. Ergül, “Design and analysis of nano-optical networks consisting of nanowires and optimized couplers,” in Proc. Int. Conf. on Electromagnetics in Advanced Applications (ICEAA), 2019, pp. 931–936.

[6] B. Karaosmanoğlu, U. Özmü, and Ö. Ergül, “Novel SIE formulations for accurate and stable analysis of near-zero-index materials,” in Proc. IEEE Antennas and Propagation Soc. Int. Symp., 2019.

[7] B. Karaosmanoğlu, B. N. Bice, and Ö. Ergül, “Geometric improvements on solar cells for reducing reflections,” in Proc. IEEE Antennas and Propagation Soc. Int. Symp., 2019.

[8] B. Karaosmanoğlu and Ö. Ergül, “Error prediction in electromagnetic simulations using machine learning,” in Proc. IEEE Antennas and Propagation Soc. Int. Symp., 2019.

[9] H. İbili, S. Keleş, and Ö. Ergül, “Multiband microwave metamaterials based on optimized arrangements of split-ring resonators,” in Proc. Progress in Electromagnetics Research Symp. (PIERS), 2019.

[10] G. Işıklar, M. Algun, and Ö. Ergül, “Improved nano-optical traps for single-particle sensing applications,” in Proc. Progress in Electromagnetics Research Symp. (PIERS), 2019.

[11] H. İbili, Y. Koyaz, U. Özmü, B. Karaosmanoğlu, and Ö. Ergül, “Novel SIE implementations for efficient and accurate electromagnetic simulations of zero-index materials,” in Proc. Progress in Electromagnetics Research Symp. (PIERS), 2019.

[12] A. Altınoklu and Ö. Ergül, “Computational design and analysis of efficient couplers for nanooptical links,” in Proc. Progress in Electromagnetics Research Symp. (PIERS), 2019.

[13] Ö. Eriş, H. İbili, and Ö. Ergül, “Inkjet-printed frequency-selective structures based on improved arrangements of U-shaped resonators,” in European Microwave Conf. in Central Europe (EuMCE), 2019, pp. 39–42.

[14] H. İbili, S. Keleş, Ö. Eriş, and Ö. Ergül, “Realization of multiband microwave metamaterials fabricated via low-cost inkjet printing,” in European Microwave Conf. in Central Europe (EuMCE), 2019, pp. 35–38.

[15] B. Karaosmanoglu, M. Tonga, and Ö. Ergül, “A broadband electromagnetic solver based on multiscale MLFMA and hybrid integral equations,” in Proc. Mediterranean Microwave Symp. (MMS), 2018, pp. 97–100.

[16] T. Dolapçı, M. S. Baloglu, F. Mutlu, and Ö. Ergül, “Novel wearable radio-frequency antennas based on woven conductive fabrics,” in Proc. Mediterranean Microwave Symp. (MMS), 2018, pp. 61–63.

[17] S. Güler, H. A. Ceylan, and Ö. Ergül, “Hexagonal-pixel surfaces for the reconfiguration of inkjet-printed antennas,” in Proc. Mediterranean Microwave Symp. (MMS), 2018, pp. 57–60.

[18] H. İbili, B. Karaosmanoglu, and Ö. Ergül, “Homogenization of microwave metamaterial structures using full-wave solutions and genetic algorithms,” in Proc. Mediterranean Microwave Symp. (MMS), 2018, pp. 244–246.

[19] F. Mutlu, M. A. Demir, and Ö. Ergül, “Improved fonts for chipless radio-frequency-identification tags based on letters,” in Proc. Mediterranean Microwave Symp. (MMS), 2018, pp. 247–250.

[20] A. Farshkaran and Ö. Ergül, “Equivalence principle algorithm for potential integral equations,” in Proc. Int. Conf. on Electromagnetics in Advanced Applications (ICEAA), 2018, 189–192.

[21] M. A. Demir, F. Mutlu, and Ö. Ergül, “Design of highly distinguishable letters for inkjet-printed chipless RFID tags,” in IEEE-APS Topical Conf. on Antennas and Propagation in Wireless Communications (IEEE APWC), 2018, pp. 783–786.

[22] U. M. Gür, Isa Can Çetin, B. Karaosmanoglu, and Ö. Ergül, “PIE-MLFMA implementation for solving complex subwavelength electromagnetic problems,” in Proc. IEEE MTT-S Int. Conf. Numerical Electromagnetic and Multiphysics Modeling and Optimization (NEMO), 2018.

[23] B. Karaosmanoglu, U. Topçuoglu, S. Güler, E. Tuygar, and Ö. Ergül, “Optimal cavities to enhance freespace matching in solar cells,” in Proc. Progress in Electromagnetics Research Symp. (PIERS), 2018, 48–52.

[24] S. Güler, A. C. Yücel, H. Bagcı, and Ö. Ergül, “Mixed discretization of CFIE in the framework of MLFMA,” in Proc. Progress in Electromagnetics Research Symp. (PIERS), 2018, 1500–1505.

[25] H. İbili, S. Güler, B. Karaosmanoglu, and Ö. Ergül, “Penetrable numerical modeling of metallic nanoparticles at terahertz frequencies,” in Proc. Progress in Electromagnetics Research Symp. (PIERS), 2018, 2273–2279.

[26] A. Farshkaran and Ö. Ergül, “Numerical implementation of equivalence principle algorithm for potentials,” in Proc. IEEE Antennas and Propagation Soc. Int. Symp., 2018, pp. 2405–2406.

[27] B. Khalichi, Ö. Ergül, M. Takrimi, and V. B. Ertürk, “Solution of potential integral equations with NSPWMLFMA,” in Proc. IEEE Antennas and Propagation Soc. Int. Symp., 2018, pp. 2307–2308.

[28] M. Kalfa, V. B. Ertürk, and Ö. Ergül, “Error control of MLFMA within a multiple-precision arithmetic framework,” in Proc. IEEE Antennas and Propagation Soc. Int. Symp., 2018, pp. 2299–2300.

[29] E. Çetin, M. B. Şahin, and Ö. Ergül, “Array strategies for improving the performances of chipless RFID tags,” in Proc. IEEE Antennas and Propagation Soc. Int. Symp., 2018, pp. 2015–2016.

[30] B. Karaosmanoglu, Ş. Yazar, and Ö. Ergül, “Design of compact nano-optical couplers involving dielectric nanorods,” in Proc. URSI General Assembly and Scientific Symp. (URSI-GASS), 2018.

[31] B. Karaosmanoglu, U. Topçuoglu, E. Tuygar, and Ö. Ergül, “Numerical investigation of nanocavities for optimal power absorption in solar cells,” in Proc. URSI General Assembly and Scientific Symp. (URSI-GASS), 2018.

[32] S. Güler, H. İbili, and Ö. Ergül, “Mitigating internal resonances of the magnetic-field integral equation via double-layer modeling,” in Proc. European Conf. on Antennas and Propagation (EuCAP), 2018.

[33] S. Güler, C. G. Sür, and Ö. Ergül, “Numerical design and investigation of plasmonic lenses for maximum power focusing,” in Proc. European Conf. on Antennas and Propagation (EuCAP), 2018.

[34] M. Kalfa, Ö. Ergül, and V. B. Ertürk, “Error control in MLFMA with multiple-precision arithmetic,” in Proc. European Conf. on Antennas and Propagation (EuCAP), 2018.

[35] A. Altınoklu, N. Rasoolzadeh, and Ö. Ergül, “Design and optimization of two-dimensional nano-arrays for beam steering,” in Proc. Int. Applied Computational Electromagnetics Soc. Symp., 2018.

[36] A. Altınoklu and Ö. Ergül, “Optical couplers for sharply bended nanowires: sensitivity to coupler nanoparticles,” in Proc. Int. Applied Computational Electromagnetics Soc. Symp., 2018.

[37] H. Eray, B. Karaosmanoğlu, and Ö. Ergül, “Full-wave electromagnetic optimizations of photonic crystals involving dielectric rods,” Proc. Progress in Electromagnetics Research Symp. (PIERS), 2017, pp. 2871–2875.

[38] U. M. Gür and Ö. Ergül, “Low-frequency breakdown of the potential integral equations and its remedy,” in Proc. Progress in Electromagnetics Research Symp. (PIERS), 2017, 676–682.

[39] U. M. Gür and Ö. Ergül, “Accurate computations of near-zone electric field when using potential integral equations, in Proc. 9th European Conference on Numerical Methods in Electromagnetics (NUMELEC), 2017.

[40] A. Altınoklu and Ö. Ergül, “Shape optimizations of metallic sheets for improved near-zone scattering, reflection, and focusing characteristics,” in Proc. European Microwave Conf. (EuMC), 2017, pp. 967–970.

[41] U. M. Gür, B. Karaosmanoğlu, and Ö. Ergül, “Solutions of new potential integral equations using approximate stable diagonalization of the Green’s function,” in Proc. Int. Conf. on Electromagnetics in Advanced Applications (ICEAA), 2017, pp. 1894–1897.

[42] H. İbili and Ö. Ergül, “Very low-cost inkjet-printed metamaterials: progress and challenges,” in Proc. IEEE MTT-S Int. Microwave Workshop Series on Advanced Materials and Processes (IMWS-APM), 2017.

[43] S. Güler, B. Solak,U. M. Gür, and Ö. Ergül, “Full-wave computational analysis of optical chiral metamaterials,” in Proc. Fourth International EMC Conference, 2017.

[44] U. M. Gür, B. Karaosmanoğlu, and Ö. Ergül, “Fast-multipole-method solutions of new potential integral equations,” in Proc. Fourth International EMC Conference, 2017.

[45] A. Altınoklu, G. Karaova, and Ö. Ergül, “Shape optimizations of metallic sheets using a multigrid approach,” in Proc. Fourth International EMC Conference, 2017.

[46] T. Dolapçı, F. Mutlu, and Ö. Ergül, “Design, simulation, and fabrication of broadband inkjet- printed log-periodic antennas,” in Proc. Fourth International EMC Conference, 2017.

[47] H. İbili, B. Karaosmanoğlu, and Ö. Ergül, “Design and fabrication of low-cost inkjet printed metamaterials,” in Proc. Fourth International EMC Conference, 2017.

[48] C. Önol, A. Üçüncü, and Ö. Ergül, “Multilayer iterative solutions of large-scale electromagnetic problems using MLFMA,” in Proc. Fourth International EMC Conference, 2017.

[49] A. Altınoklu and Ö. Ergül, “Computational analysis and full-wave optimizations of nanoantenna arrays for desired scattering and radiation characteristics,” in URSI General Assembly and Scientific Symp. (URSI-GASS), 2017.

[50] S. Güler, C. Önol, Ö. Ergül, E. Sever, F. Dikmen, and Y. A. Tuchkin, “Fastly converging 2D solutions of TE-EFIE on modified superformula contours optimized via genetic algorithms,” in Proc. IEEE Antennas and Propagation Soc. Int. Symp., 2017, pp. 1461–1462.

[51] U. M. Gür, E. Üstün, Ö. Eroğlu, F. Dikmen, and Ö. Ergül, “Computational demonstration of multiband nanoantennas for power enhancement,” in Proc. IEEE Antennas and Propagation Soc. Int. Symp., 2017,pp. 135–136.

[52] B. Karaosmanoğlu, H. A. Şatana, F. Dikmen, and Ö. Ergül, “Investigation of alternative array configurations of nanowires for maximum power transmission at optical frequencies,” in Proc. IEEE Antennas and Propagation Soc. Int. Symp., 2017, pp. 123–124.

[53] S. Güler, C. Önol, Ö. Ergül, E. Sever, F. Dikmen, and Y. A. Tuchkin, “Modified superformula contours optimized via genetic algorithms for exponentially converging 2D solutions of MFIE,” in Proc. Progress in Electromagnetics Research Symp. (PIERS), 2017, pp. 2945–2947.

[54] B. Karaosmanoğlu and Ö. Ergül, “Accuracy of the surface integral-equation formulations for large negative permittivity values,” in Proc. Progress in Electromagnetics Research Symp. (PIERS), 2017, pp. 926–933.

[55] E. Üstün, Ö. Eroğlu, U. M. Gür, and Ö. Ergül, “Investigation of nanoantenna geometries for maximum field enhancements at optical frequencies,” in Proc. Progress in Electromagnetics Research Symp. (PIERS), 2017, pp. 3673–3680.

[56] C. Önol, A. Üçüncü, and Ö. Ergül, “Efficient three-layer iterative solutions of electromagnetic problems using the multilevel fast multipole algorithm,” in IEEE MTT-S Int. Conf. Numerical Electromagnetic and Multiphysics Modeling and Optimization for RF, Microwave, and Terahertz Applications (NEMO), 2017, pp. 170–172.

[57] B. Karaosmanoğlu and Ö. Ergül, “Modified combined tangential formulation for stable and accurate analysis of plasmonic structures,” in Proc. Int. Applied Computational Electromagnetics Soc. Symp., 2017.

[58] B. Karaosmanoğlu, S. Güler, H. İbili, and Ö. Ergül, “Inkjet-printed pixel antennas with hexagonal cells,” in Proc. European Conf. on Antennas and Propagation (EuCAP), 2017, pp. 2013–2016.

[59] C. Önol, A. Üçüncü, B. Karaosmanoğlu, and Ö. Ergül, “Nested iterative solutions of electromagnetic problems using approximate forms of the multilevel fast multipole algorithm,” in Proc. European Conf. on Antennas and Propagation (EuCAP), 2017, pp. 1109–1112.

[60] B. Karaosmanoğlu, A. Yılmaz, and Ö. Ergül, “Development and application of a broadband multilevel fast multipole algorithm for challenging multiscale problems,” in Proc. Progress in Electromagnetics Research Symp. (PIERS), 2016, pp. 4713–4716.

[61] B. Karaosmanoğlu, A. Yılmaz, and Ö. Ergül, “On the accuracy and efficiency of surface formulations in fast analysis of plasmonic structures via MLFMA,” in Proc. Progress in Electromagnetics Research Symp. (PIERS), 2016, pp. 2629–2633.

[62] B. Karaosmanoğlu, C. Önol, S. Güler, A. Altınoklu, and Ö. Ergül, “Full-wave electromagnetic optimizations using surface integral equations and the multilevel fast multipole algorithm,” in Proc. Progress in Electromagnetics Research Symp. (PIERS), 2016, pp. 262–266.

[63] A. Yılmaz, B. Karaosmanoğlu, and Ö. Ergül, “Analysis of optical properties of nanowires using surface integral equations and the multilevel fast multipole algorithm,” in Proc. Advanced Electromagnetic Symp., 2016.

[64] Ö. Ergül, B. Karaosmanoğlu, M. Takrimi, and V. B. Ertürk, “Broadband multilevel fast multipole algorithm for large-scale problems with nonuniform discretizations,” in Proc. Int. Symp. on Electromagnetic Theory (EMTS), 2016, pp. 284–287.

[65] S. Güler, C. Önol, Ö. Ergül, M. E. Hatipoğlu, E. Sever, F. Dikmen, and Y. A. Tuchkin, “Modified superformula contours optimized via genetic algorithms for fastly converging 2D solutions of EFIE,” in Proc. IEEE Antennas and Propagation Soc. Int. Symp., 2016, pp. 1333–1334.

[66] A. Altınoklu, B. Karaosmanoğlu, and Ö. Ergül, “Full-wave electromagnetic optimizations of corrugated metallic sheets,” in Proc. IEEE Antennas and Propagation Soc. Int. Symp., 2016, pp. 1325–1326.

[67] B. Karaosmanoğlu and Ö. Ergül, “Improving the accuracy of MFIE and CFIE by using numerically designed testing functions,” in Proc. IEEE Antennas and Propagation Soc. Int. Symp., 2016, pp. 317–318.

[68] T. Çiftçi, B. Karaosmanoğlu, and Ö. Ergül, “Low-cost inkjet antennas for RFID applications [extended],” IOP Conf. Ser.: Mater. Sci. Eng., vol. 120, no. 1, Apr. 2016.

[69] B. Karaosmanoğlu and Ö. Ergül, “Numerical design of testing functions for the magnetic-field integral equation,” in Proc. European Conf. on Antennas and Propagation (EuCAP), 2016.

[70] M. Akbaş, L. Alatan, and Ö. Ergül, “Accuracy and efficiency improvements in iterative hybridization of the method of moments (MoM) and physical optics (PO),” in Proc. European Conf. on Antennas and Propagation (EuCAP), 2016.

[71] M. Takrimi, Ö. Ergül, and V. B. Ertürk, “A broadband multilevel fast multipole algorithm with incomplete-leaf tree structures for multiscale electromagnetic problems,” in Proc. European Conf. on Antennas and Propagation (EuCAP), 2016.

[72] T. Çiftçi, B. Karaosmanoğlu, and Ö. Ergül, “Low-cost inkjet antennas for RFID applications,” in Proc. IEEE Radio and Antenna Days of the Indian Ocean, 2015.

[73] B. Karaosmanoğlu, A. Yılmaz, and Ö. Ergül, “Full-wave analysis of three-dimensional optical metamaterials involving deformed nanowires,” in Proc. Int. Cong. on Advanced Electromagnetic Materials in Microwaves and Optics (Metamaterials), 2015, pp. 136–138.

[74] Ö. Ergül, C. Önol, and B. Karaosmanoğlu, “Optimizations of EFIE and MFIE combinations in hybrid formulations of conducting bodies,” in Proc. Int. Conf. on Electromagnetics in Advanced Applications (ICEAA), 2015, pp. 1276–1279.

[75] Ö. Ergül and B. Karaosmanoğlu, “Broadband MLFMA based on an approximate diagonalization of the three-dimensional Green’s function,” in Proc. Int. Conf. on Electromagnetics in Advanced Applications (ICEAA), 2015, pp. 1272–1275.

[76] B. Karaosmanoğlu, A. Yılmaz, U. M. Gür, and Ö. Ergül, “Solutions of plasmonic structures using the multilevel fast multipole algorithm,” in Proc. Third International EMC Conference, 2015.

[77] Ö. Ergül, B. Karaosmanoğlu, and C. Önol, “Electromagnetic optimizations using heuristic algorithms combined with the ordinary and approximate forms of the multilevel fast multipole algorithm,” in Proc. Int. Conf. on Matrix Methods in Mathematics and Applications (MMMA), 2015, pp. 37–38.

[78] B. Karaosmanoğlu and Ö. Ergül, “Hybrid surface integral equations for optimal analysis of perfectly conducting bodies,” in Proc. IEEE Antennas and Propagation Soc. Int. Symp., 2015, pp. 1160–1161.

[79] C. Önol, B. Karaosmanoğlu, and Ö. Ergül, “Antenna switch optimizations using genetic algorithms accelerated with the multilevel fast multipole algorithm,” in Proc. IEEE Antennas and Propagation Soc. Int. Symp., 2015, pp. 1338–1339.

[80] C. Önol, T. Çiftçi, S. Küçük, B. Karaosmanoğlu, and Ö. Ergül, “Design, simulation, and fabrication of low-cost inkjet antennas,” in Proc. Progress in Electromagnetics Research Symp. (PIERS), 2015, pp. 2829–2833.

[81] C. Önol, Ö. Gökçe, H. Boyacı, and Ö. Ergül, “Rigorous optimizations of three-dimensional antenna arrays using full-wave simulations,” in Proc. Progress in Electromagnetics Research Symp. (PIERS), 2015, pp. 2230–2234.

[82] B. Karaosmanoğlu, U. M. Gür, and Ö. Ergül, “Investigation of nanoantennas using surface integral equations and the multilevel fast multipole algorithm,” in Proc. Progress in Electromagnetics Research Symp. (PIERS), 2015, pp. 2026–2030.

[83] B. Karaosmanoğlu, A. Yılmaz, and Ö. Ergül, “Rigorous analysis of deformed nanowires using the multilevel fast multipole algorithm,” in Proc. European Conf. on Antennas and Propagation (EuCAP), 2015.

[84] Ö. Ergül and B. Karaosmanoğlu, “Using multiple-precision arithmetic to prevent low-frequency breakdowns in the diagonalization of the Green’s function,” in Proc. Progress in Electromagnetics Research Symp. (PIERS), 2014, pp. 2311–2315.

[85] Ö. Ergül and B. Karaosmanoğlu, “Low-frequency multilevel fast multipole algorithm using an approximate diagonalization of the Green’s function,” in Proc. XXXI URSI General Assembly and Scientific Symp. of Int. Union of Radio Science, 2014.

[86] B. Karaosmanoğlu and Ö. Ergül, “Stabilization of the fast multipole method for low frequencies using multiple-precision arithmetic,” in Proc. XXXI URSI General Assembly and Scientific Symp. of Int. Union of Radio Science, 2014.

[87] Ö. Ergül, “Fast full-wave solutions of realistic metamaterial structures,” in Proc. Ninth Int. Conf. on Computation in Electromagnetics, 2014.

[88] Ö. Ergül, “Parallel multilevel fast multipole algorithm for complex plasmonic metamaterial structures,” in Proc. Int. Conf. on Electronics, Computer and Computation (ICECCO), 2013, pp. 343–346.

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**International Conference Abstracts**

[1] S. Güler, Ö. Eriş, A. S. Ayık, and Ö. Ergül, “Design of effective gradient-index lenses involving penetrable elements via heuristic optimizations and full-wave simulations,” in Proc. Progress in Electromagnetics Research Symp. (PIERS), 2019.

[2] S. Güler, H. İbili, and Ö. Ergül, “Resonance-free magnetic-field integral equation with double-layer modeling: further improvements,” in Proc. Progress in Electromagnetics Research Symp. (PIERS), 2019.

[3] S. Güler, A. S. Ayık, and Ö. Ergül, “Computational design of nano-optical tags for reliable identification systems,” in Proc. Progress in Electromagnetics Research Symp. (PIERS), 2019.

[4] E. Çetin, M. B. Şahin, and Ö. Ergül, “Novel inkjet-printed chipless tags for radio-frequencyidentification applications,” in IEEE-APS Topical Conf. on Antennas and Propagation in Wireless Communications (IEEE APWC), 2019, p. 288.

[5] S. Güler, H. İbili, and Ö. Ergül, “Double-layer modeling to overcome internal resonance problem of MFIE,” in Proc. Progress in Electromagnetics Research Symp. (PIERS), 2018.

[6] B. Khalichi, Ö. Ergül, and V. B. Ertürk, “Error analysis of QR-decomposition based nondirective stable plane wave MLFMA,” IEEE Antennas and Propagation Soc. Int. Symp., Jul. 2018.

[7] A. Altınoklu and Ö. Ergül, “Design and analysis of optimal couplers for maximum power transmission through bended nanowire systems,” in Proc. Progress in Electromagnetics Research Symp. (PIERS) , Nov. 2017.

[8] C. G. Sür, B. Solak, Ö. Eroğlu, Ş. Yazar, A. Altınoklu, S. Güler, U. M. Gür, B. Karaosmanoğlu, and Ö. Ergül, “Efficient and accurate analysis of three-dimensional nano-optical structures: frequency-selective surfaces, metamaterials, nanoantennas, nanowires, and photonic crystals,” 10th Japanese-Mediterranean Workshop on Applied Electromagnetic Engineering for Magnetic, Superconducting, Multifunctional and Nanomaterials (JAPMED), Jul. 2017.

[9] M. Takrimi, Ö. Ergül, and V. B. Ertürk, “Incomplete-leaf multilevel fast multipole algorithm for penetrable objects using volume integral equations,” IEEE Antennas and Propagation Soc. Int. Symp., Jun. 2016.

[10] M. Akbaş, L. Alatan, and Ö. Ergül, “Accuracy and efficiency improvement in EI-MoM-PO hybrid method,” Integral Techniques for Electromagnetics (INTELECT), Cappadocia, Turkey, Sep. 2015.

[11] M. Takrimi, Ö. Ergül, and V. B. Ertürk, “Fast and accurate solutions of multiscale problems using incomplete leaf MLFMA,” Integral Techniques for Electromagnetics (INTELECT), Cappadocia, Turkey, Sep. 2015.

[12] B. Karaosmanoğlu, T. Çiftçi, and Ö. Ergül, “Challenges in low-cost inkjet antennas,” IEEE Antennas and Propagation Soc. Int. Symp., Vancouver, BC, Canada, Jul. 2015, p. 181.

[13] B. Karaosmanoğlu and Ö. Ergül, “Broadband implementation of MLFMA using approximate scaled diagonalization of the Green’s function,” URSI Atlantic Radio Science Conf. (URSI AT-RASC), Gran Canaria, Canary Islands, May 2015.

[14] C. Önol, Ö. Gökçe, and Ö. Ergül, “Dual-band antenna array optimizations using heuristic algorithms and the multilevel fast multipole algorithm,” in Proc. URSI Atlantic Radio Science Conf. (URSI AT-RASC), Gran Canaria, Canary Islands, May 2015.

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**National Conference Papers**

[1] E. Çetin, M. B. Sahin, and Ö. Ergül, “Design of highly distinguishable chipless tag for radio-frequency-identification applications,” in Turkish, URSI-Turkey Scientific Symp., 2018.

[2] F. Mutlu and Ö. Ergül, “Cuttable inkjet-printed log-periodic antennas,” in Turkish, URSI-Turkey Scientific Symp., 2018.

[3] A. Altınoklu, U. Gökmen, and Ö. Ergül, “Design of optical couplers for increasing the power transmission in nanowire transmission lines involving sharp corners,” in Turkish, URSI-Turkey Scientific Symp., 2018.

[4] B. Karaosmanoglu, S. Yazar, and Ö. Ergül, “Design of optical couplers via optimization of photonic crystal structures,” in Turkish, URSI-Turkey Scientific Symp., 2018.

[5] F. Mutlu, M. A. Demir, and Ö. Ergül, “Improved letter-shaped tag designs for chipless RF identification applications,” in Turkish, URSI-Turkey Scientific Symp., 2018.

[6] M. Kalfa, Ö. Ergül, and V. B. Ertürk, “Error control of the multilevel fast multipole algorithm using multiple precision arithmetic,” in Turkish, URSI-Turkey Scientific Symp., 2018.

[7] G. Isıklar, Isa Can Çetin, M. Algun, Ö. Eroglu, and Ö. Ergül, “Design and analysis of nanoantenna arrays for sensing and imaging applications at optical frequencies,” in Turkish, URSI-Turkey Scientific Symp., 2018.

[8] B. Karaosmanoglu, H. İbili, and Ö. Ergül, “Homogenization of structures with negative permeability using genetic algorithms,” in Turkish, URSI-Turkey Scientific Symp., 2018.

[9] H. İbili, Y. Koyaz, and Ö. Ergül, “Accurate and fast analysis of materials with zero indices using surface integral equations,” in Turkish, URSI-Turkey Scientific Symp., 2018.

[10] S. Güler, H. İbili, and Ö. Ergül, “Solution of the internal-resonance problem in the magnetic-field integral equation via double-layer modeling,” in Turkish, URSI-Turkey Scientific Symp., 2018.

[11] H. İbili, S. Keles, and Ö. Ergül, “Design of three-dimensional multiband microwave metamaterials,” in Turkish, URSI-Turkey Scientific Symp., 2018.

[12] B. Karaosmanoglu, H. İbili, S. Güler, and Ö. Ergül, “Accurate solutions of electromagnetic problems involving very large targets,” in Turkish, 9th Congress of Defense Technologies, 2018, pp. 913–917.

[13] H. İbili, S. Güler, F. Mutlu, Ö. Ergül, “Fabrication of radio-frequency components using inkjet printing technology,” in Turkish, 9th Congress of Defense Technologies, 2018,pp. 661–666.

[14] T. Dolapçı, M. S. Baloglu, and Ö. Ergül, “Design and fabrication of antennas with alternative materials for radio-frequency applications,” in Turkish, 9th Congress of Defense Technologies, 2018, pp. 653–659.

[15] S. Güler, A. Altınoklu, G. Karaova, I. C. Çetin, Ö. Eroglu, U. M. Gür, and Ö. Ergül, “Simulation and design of plasmonic nanostructures for chemical sensing applications,” in Turkish, 9th Congress of Defense Technologies, 2018, pp. 445–451.

[16] B. Karaosmanoğlu, A. Yılmaz, and Ö. Ergül, “Fast and accurate analysis of plasmonic structures at optical frequencies using the multilevel fast multipole algorithm,” in Turkish, URSI-Turkey Scientific Symp., 2016.

[17] N. Hosseini, C. Önol, and Ö. Ergül, “Optimizations and simulations of three-dimensional finite photonic crystal structures with the multilevel fast multipole algorithm,” in Turkish, URSI-Turkey Scientific Symp., 2016.

[18] C. Önol and Ö. Ergül, “Full-wave electromagnetic optimizations via genetic algorithms and the multilevel fast multipole algorithm,” in Turkish, URSI-Turkey Scientific Symp., 2016.

[19] U. M. Gür and Ö. Ergül, “Analysis of low-frequency-breakdown-resistant potential formulations using the method of moments” in Turkish, URSI-Turkey Scientific Symp., 2016.

[20] M. Akbaş, L. Alatan, and Ö. Ergül, “Improving the accuracy and efficiency of the hybrid method of moments and physical optics,” in Turkish, URSI-Turkey Scientific Symp., 2016.

[21] U. M. Gür, İ. E. Üstün, and Ö. Ergül, “Analysis of electromagnetic power enhancement factors of nanoantennas using surface integral equations,” in Turkish, URSI-Turkey Scientific Symp., 2016.

[22] F. Mutlu, B. Karaosmanoğlu, and Ö. Ergül, “Design and measurement of inkjet-printed antennas for radio-frequency-identification applications,” in Turkish, URSI-Turkey Scientific Symp., 2016.

[23] B. Karaosmanoğlu and Ö. Ergül, “Design of numerical testing functions for the magnetic-field integral equation,” in Turkish, URSI-Turkey Scientific Symp., 2016.

[24] B. Karaosmanoğlu, H. İbili, and Ö. Ergül, “Design and fabrication of low-cost metamaterials via inkjet printing technique,” in Turkish, URSI-Turkey Scientific Symp., 2016.

[25] B. Karaosmanoğlu, A. Yılmaz, and Ö. Ergül, “Accurate full-wave simulations of nanowires at optical frequencies using the multilevel fast multipole algorithm,” Nanoscience & Nanotechnology Conf. (NanoTR), Ankara, Turkey, 2015.

[26] B. Karaosmanoğlu and Ö. Ergül, “A broadband multilevel fast multipole algorithm based on the scaled diagonalization of the Green’s function,” in Turkish, URSI-Turkey Scientific Symp., 2014.

[27] B. Karaosmanoğlu, U. M. Gür, and Ö. Ergül, “Accurate analysis of nanoantennas with plasmonic properties using surface integral equations,” in Turkish, URSI-Turkey Scientific Symp., 2014.

[28] B. Karaosmanoğlu, A. Yılmaz, and Ö. Ergül, “Fast and accurate analysis of nanowires with the multilevel fast multipole algorithm,” in Turkish, URSI-Turkey Scientific Symp., 2014.

[29] C. Önol, İ. Genel, B. Eliş, and Ö. Ergül, “Design of patch antenna arrays using genetic algorithms and the multilevel fast multipole algorithm,” in Turkish, URSI-Turkey Scientific Symp., 2014.

[30] F. A. Tunç, F. Gökçe, C. Önol, B. Karaosmanoğlu, and Ö. Ergül, “Design and simulations of inkjet-type antennas suitable for printing on paper,” in Turkish, URSI-Turkey Scientific Symp., 2014.

[31] T. Çiftçi, A. Erol, and Ö. Ergül, “Accurate full-wave simulations of three-dimensional finite photonic crystal structures,” in Turkish, URSI-Turkey Scientific Symp., 2014.

[32] T. Çiftçi, A. E. Ofluoğlu, and Ö. Ergül, “Simulations of fishnet-type optical metamaterials using surface integral equations and the multilevel fast multipole algorithm,” in Turkish, URSI-Turkey Scientific Symp., 2014.

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**National Conference Abstracts**

[1] H. İbili, B. Karaosmanoglu, and Ö. Ergül, “Computational electromagnetic simulations of zero-index materials,” Computational Science and Engineering Conference (BEYOND), 2019.

[2] S. Güler, Ö. Eriş and Ö. Ergül, “Geometric design of gradient index lenses via heuristic optimization and full-wave simulations,” Computational Science and Engineering Conference (BEYOND), 2019.

[3] G. Isıklar and Ö. Ergül, “Computational design of enhanced plasmonic nanotraps for particle sensing applications,” Computational Science and Engineering Conference (BEYOND), 2019.

[4] G. Karaova and Ö. Ergül, “Design and simulations of nano-optical couplers with genetic algorithms and MLFMA,” Computational Science and Engineering Conference (BEYOND), 2019.

[5] B. Karaosmanoglu and Ö. Ergül, “Accelerating electrically large-scale electromagnetic simulations using machine learning,” Computational Science and Engineering Conference (BEYOND), 2019.

[6] A. Altınoklu and Ö. Ergül, “Full-wave electromagnetic optimization of nanoparticle arrays for different nano-plasmonic applications,” Workshop on Computational Science and Engineering (BEYOND), 2018.

[7] B. Karaosmanoğlu and Ö. Ergül, “Computational electromagnetic simulations of electrically large structures,” Workshop on Computational Science and Engineering (BEYOND), 2018.

[8] G. Işıklar and Ö. Ergül, “Computational study of nanoantenna arrays for particle detection,” Workshop on Computational Science and Engineering (BEYOND), 2018.

[9] H. İbili and Ö. Ergül, “Computational electromagnetic simulations of three-dimensional structures with exotic material properties,” Workshop on Computational Science and Engineering (BEYOND), 2018.

[10] S. Güler and Ö. Ergül, “Heuristic optimization of three-dimensional structures for diverse electromagnetic applications,” Workshop on Computational Science and Engineering (BEYOND), 2018.

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**URSI-Bulletin Contributions**

[1] A. Altınoklu and Ö. Ergül, “SOLBOX-16,” Radio Science Bulletin, no. 369, pp. 22–27, Jun. 2019.

[2] Ö. Eriş, H. Ibili, and Ö. Ergül, “SOLBOX-15,” Radio Science Bulletin, no. 368, pp. 20–25, Mar. 2019.

[3] S. E. Senem, S. Alkış, and Ö. Ergül, “SOLBOX-14,” Radio Science Bulletin, no. 367, pp. 17–20, Dec. 2018.

[4] A. Altınoklu and Ö. Ergül, “SOLBOX-13,” Radio Science Bulletin, no. 367, pp. 16–31, Sep. 2018.

[5] H. İbili, B. Karaosmanoglu, and Ö. Ergül, “SOLBOX-12,” Radio Science Bulletin, no. 365, pp. 43–47, Jun. 2018.

[6] B. Karaosmanoglu, M. Tonga, and Ö. Ergül, “SOLBOX-11,” Radio Science Bulletin, no. 364, pp. 69–74, Mar. 2018.

[7] A. Farshkaran and Ö. Ergül, “SOLBOX-09 and SOLBOX-10,” Radio Science Bulletin, no. 363, pp. 83–88, Dec. 2017.

[8] A. Altınoklu and Ö. Ergül, “SOLBOX-08,” Radio Science Bulletin, no. 362, pp. 97–101, Sep. 2017.

[9] Ş. Yazar, B. Karaosmanoğlu, and Ö. Ergül, “SOLBOX-07,” Radio Science Bulletin, no. 361, pp. 71–74, Jun. 2017.

[10] A. Altınoklu and Ö. Ergül, “SOLBOX-06,” Radio Science Bulletin, no. 360, pp. 108–111, Mar. 2017.

[11] B. Karaosmanoğlu and Ö. Ergül, “SOLBOX-05,” Radio Science Bulletin, no. 359, pp. 43–45, Dec. 2016.

[12] B. Karaosmanoğlu, A. Yılmaz, and Ö. Ergül, “SOLBOX-01,” Radio Science Bulletin, no. 353, pp. 33–36, Jun. 2015.

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**Unpublished Research Reports**

[1] H. Boyacı, C. Önol, and Ö. Ergül, “Optimizations of antenna arrays using particle swarm optimization methods,” CEMMETU, Middle East Technical University, pp. 1–5, Jun. 2015. PDF

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**Thesis**

[1] A. Farshkaran, Implementation of the Equivalence Principle Algorithm for Potential Integral Equations, MS Thesis, Middle East Technical University, Jun. 2018.

[2] U. M. Gür, Solutions of Novel Potential-Based Formulations Using the Multilevel Fast Multipole Algorithm, MS Thesis, Middle East Technical University, Feb. 2018.

[3] F. Mutlu, MS Thesis, Design, Simulation, and Fabrication of Low-Cost Inkjet Antennas, 2016.

[4] C. Önol, MS Thesis, Optimizations of Antennas Using Heuristic Algorithms Supported by The Multilevel Fast Multipole Algorithm, 2015.

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**Collections**

[1] CEMMETU Book of Knowledge Vol. 1, 2016 (104 Pages, 410 Slides, Reduced Size)

[2] CEMMETU Book of Knowledge Vol. 2, 2016 (123 Pages, 487 Slides, Reduced Size)

[3] CEMMETU Book of Knowledge Vol. 3, 2017 (87 Pages, 341 Slides, Reduced Size)

[4] CEMMETU Book of Knowledge Vol. 4, 2018 (139 Pages, 550 Slides, Reduced Size)

[5] CEMMETU Book of Knowledge Vol. 5, 2019 (91 Pages, 360 Slides, Reduced Size)

[6] CEMMETU Book of Knowledge Vol. 6, 2019 (87 Pages, 342 Slides, Reduced Size)