1. Feng, Y. B., T. Qiu, and C. Y. Shen, "Absorbing properties and structural design of microwave absorbers based on carbonyl iron and barium ferrite," Journal of Magnetism and Magnetic Materials, Vol. 318, No. 1--2, 8-13, 2007.
doi:10.1016/j.jmmm.2007.04.012

2. Macedo, J., M. de Sousa, and V. Dmitriev, "Optimization of wide band multilayer microwave absorbers for any angle of incidence and arbitrary polarization," Microwave and Optoelectronics, 558-561, 2005.

3. Chew, W. C., Waves and Fields in Inhomogeneous Media, IEEE Press, New York, 1995.

4. Balanis, C. A., Advanced Engineering Electromagnetics, John Wiley, 1989.

5. Ciuprina, G., D. Ioan, and I. Munteanu, "Use of intelligent-particle swarm optimization in electromagnetics," IEEE Trans. on Magnetics, Vol. 38, No. 2, 1037-1040, March 2002.
doi:10.1109/20.996266

6. Robinson, J. and Y. Rahmat-Samii, "Particle swarm optimization in electromagnetics," IEEE Trans. on Antennas and Propagation, Vol. 52, No. 2, 397-407, 2004.
doi:10.1109/TAP.2004.823969

7. Chamaani, S., S. Mirtaheri, and M. Shooredeli, "Design of very thin wide band absorbers using modified local best particle swarm optimization," AEU | Int. J. Electron. Commun., Vol. 62, 549-556, 2008.

8. Feoktistov, V., Differential Evolution: In Search of Solutions, Springer Science, 2006.

9. Tvrdík, J., V. Pavliska, and H. Habiballa, Stochastic Self-adaptive Algorithms for Global Optimization --- MATLAB and C++ Library, http://albert.osu.cz/oukip/optimization/.

10. Goudos, S., "Design of microwave broadband absorbers using a self-adaptive differential evolution algorithm," Int. J. RF and Microwave CAE, Vol. 19, 364-372, May 2009.
doi:10.2528/PIERC10041310

11. Dib, N., M. Asi, and A. Sabbah, "On the optimal design of multilayer microwave absorbers," Progress In Electromagnetics Research C, Vol. 13, 171-185, 2010.
doi:10.1016/j.ins.2009.03.004

12. Rashedi, E., H. Nezamabadi-pour, and S. Saryazdi, "GSA: A gravitational search algorithm," Information Sciences, Vol. 179, 2232-2248, 2009.
doi:10.2528/PIER07082403

13. Formato, R. A., "Central force optimization: A new metaheuristic with applications in applied electromanetics," Progress In Electromagnetics Research, Vol. 77, 425-491, 2007.
doi:10.1504/IJBIC.2009.024721

14. Formato, R. A., "Central force optimization: A new gradient-like metaheuristic for multidimensional search and optimization," International Journal of Bio-inspired Computation, Vol. 1, No. 4, 217-238, 2009.
doi:10.1049/iet-map.2009.0147

15. Mohammad, G., N. Dib, and R. A. Formato, "Antenna benchmark performance and array synthesis using central force optimization," IET Microw. Antennas Propag., Vol. 4, No. 5, 583-592, 2010.
doi:10.2528/PIERB09112309

16. Formato, R. A., "Improved CFO algorithm for antenna optimization," Progress In Electromagnetics Research B, Vol. 19, 405-425, 2010.

17. Qubati, G. and N. Dib, "Microstrip patch antenna optimization using modified central force optimization," Progress In Electromagnetics Research B, Vol. 21, 281-298, 2010.
doi:10.1109/22.238519

18. Michielssen, E., J.-M. Sajer, S. Ranjithant, and R. Mittra, "Design of lightweight, broad-band microwave absorbers using genetic algorithms," IEEE Trans. Microwave Theory Tech., Vol. 4, 1024-1030, 1993.
doi:10.1049/iet-map.2008.0059

19. Jiang, L., J. Cui, L. Shi, and X. Li, "Pareto optimal design of multilayer microwave absorbers for wide-angle incidence using genetic algorithms," IET Microwave Antennas Propagation, Vol. 3, No. 4, 572-579, June 009.