Dinh Phu, Nguyen, and Tran Thanh Tung. “SHEAF- OPTIMAL CONTROL PROBLEM IN FUZZY TYPE”. Science and Technology Development Journal 8, no. 12 (December 31, 2005): 5-11. Accessed April 28, 2024. http://stdj.scienceandtechnology.com.vn/index.php/stdj/article/view/3100.