Huynh, Diem. “Characterizations of Variational Convergence of Bifunctions Defined on Products of Two Sets”. VNUHCM Journal of Engineering and Technology 3, no. SI3 (December 31, 2020): SI141-SI149. Accessed April 24, 2024. http://stdjet.scienceandtechnology.com.vn/index.php/stdjet/article/view/643.