Dung, To, and Mai Thanh. “THE DISPERSION FUNCTION- SOME PROPERTIES AND THE CONVERGENCE IN SPACE Lk”. Science and Technology Development Journal 11, no. 10 (October 31, 2008): 25-33. Accessed April 4, 2025. http://stdj.scienceandtechnology.com.vn/index.php/stdj/article/view/2698.