Su, T. V., and D. D. Hang. 2020. “CLOSEDNESS OF THE OPTIMAL SOLUTION SETS FOR GENERAL VECTOR ALPHA OPTIMIZATION PROBLEMS”. Journal of Nonlinear Analysis and Optimization: Theory & Applications (JNAO) 11 (1):1-14. https://ph03.tci-thaijo.org/index.php/jnao/article/view/2821.