Tran, Le, Nguyen Chi, and Tran Tuan. “THE GENERATION OF NEGATIVE ION OXYGEN WITH ZnO:Al TARGET IN DC MAGNETRON SYSTEM”. Science and Technology Development Journal 7, no. 1 (January 31, 2004): 15-19. Accessed May 19, 2024. http://stdj.scienceandtechnology.com.vn/index.php/stdj/article/view/3147.