Song Giang, Le, Dau Van Ngo, and Nguyen Cuu Tue. “AN OPTIMIZATION PROBLEM FOR RIVER WATER QUALITY CONTROL”. VNUHCM Journal of Science and Technology Development 6, no. 11 (November 30, 2003): 21-26. Accessed August 31, 2025. http://stdj.scienceandtechnology.com.vn/index.php/stdj/article/view/3372.