Pham, Ngoc Anh Tho, Kim Yen Ngo Thi, Duc Thinh Vo, and Thi Tran Chau Pham. “Parabolic Subdifferential and Its Applications to Optimality Conditions”. Chuyên san Khoa học Tự nhiên 12, no. 2 (March 14, 2023): 27–34. Accessed September 23, 2026. https://dthujs.vn/index.php/nsvi/article/view/12.