Le N-K, Tran V-N, Nguyen V-H. Some applications of directional subdifferentials at infinity to vector optimization problems. HPU2. Nat. Sci. Tech [Internet]. 2026 Apr. 28 [cited 2026 Apr. 29];5(01):76-8. Available from: https://sj.hpu2.edu.vn/index.php/journal/article/view/579