Trinh, Lang, Tao Chau, Chien Le, Hong Huynh, and Tram Huynh. “Positron Annihilation Rate in Single Atom With Slater Type Orbital Approximation”. Science and Technology Development Journal 16, no. 4 (December 31, 2013): 43-51. Accessed May 4, 2024. http://stdj.scienceandtechnology.com.vn/index.php/stdj/article/view/1595.