Tung, Nguyen Thanh, Pham Van Hoai, Nguyen Trung Binh, Le Van Hong, Vu Dinh Lam, and Y. P. Lee. “{Demonstrate the Double Negative Behavior of Metamaterial Using the Effective Medium Theory”. Communications in Physics 20, no. 1 (August 13, 2012): 83. Accessed March 29, 2024. https://vjs.ac.vn/index.php/cip/article/view/2009.