Kucukoner, E. M., A. Cinar, U. Kose, and E. Ekmekci. “Electrical Size Reduction of Microstrip Antennas by Using Defected Ground Structures Composed of Complementary Split Ring Resonator”. Advanced Electromagnetics, vol. 10, no. 1, Apr. 2021, pp. 62-69, doi:10.7716/aem.v10i1.1556.