Nguyen, Huy-Hung, Ngoc-Tuan Hoang, and Van-Tuyen Nguyen. “Necessary Optimality Conditions for Approximate Pareto Efficient Solutions of Nonsmooth Fractional Interval-Valued Multiobjective Optimization Problems”. HPU2 Journal of Science: Natural Sciences and Technology 1, no. 2 (December 28, 2022): 81–90. Accessed April 3, 2025. https://sj.hpu2.edu.vn/index.php/journal/article/view/159.