Su, T. V., and D. D. Hang. “CLOSEDNESS OF THE OPTIMAL SOLUTION SETS FOR GENERAL VECTOR ALPHA OPTIMIZATION PROBLEMS”. Journal of Nonlinear Analysis and Optimization: Theory & Applications (JNAO) 11, no. 1 (April 6, 2020): 1–14. accessed September 2, 2026. https://ph03.tci-thaijo.org/index.php/jnao/article/view/2821.