Tung, Phan Duy, Phan Huu Lam, and Nguyen Thi Quynh Hoa. “A Miniaturization of Microstrip Antenna Using Negative Permitivity Metamaterial Based on CSRR-Loaded Groundfor WLAN Applications”. <i>Vietnam Journal of Science and Technology</i> 54, no. 6 (December 7, 2016): 689–697. Accessed January 11, 2026. https://vjs.ac.vn/jst/article/view/8375.