Tung, Phan Duy, Phan Huu Lam, and Nguyen Thi Quynh Hoa. 2016. “A Miniaturization of Microstrip Antenna Using Negative Permitivity Metamaterial Based on CSRR-Loaded Groundfor WLAN Applications”. Vietnam Journal of Science and Technology 54 (6). Hanoi, VN:689-97. https://doi.org/10.15625/0866-708X/54/6/8375.