Le, Dai, Hung Nguyen, and Kieu Phan. “The GAP Function of a Parametric Mixed Strong Vector Quasivariational Inequality Problem”. Science and Technology Development Journal 20, no. K2 (June 30, 2017): 126-130. Accessed May 4, 2024. http://stdj.scienceandtechnology.com.vn/index.php/stdj/article/view/458.