Ngoc Thanh, Dinh, and Chu Tho. “REGULARIZED SOLUTIONS OF AN INTEGRAL EQUATION OF GRAVIMETRY”. Science and Technology Development Journal 5, no. 9 (September 30, 2002): 43-54. Accessed May 22, 2024. http://stdj.scienceandtechnology.com.vn/index.php/stdj/article/view/3441.