Huynh, Diem. “Optimality Conditions and Duality With New Variants of Generalized Derivatives and Convexity”. VNUHCM Journal of Engineering and Technology 4, no. SI2 (January 31, 2022): SI20-SI27. Accessed April 26, 2024. http://stdjet.scienceandtechnology.com.vn/index.php/stdjet/article/view/916.