Vo, Duc Thinh, and Ngoc Cam Huynh. “Derivatives With Degree of Freedom of Multifunctions and Application”. Dong Thap University Journal of Science 13, no. 2 (March 14, 2024): 116–120. Accessed May 11, 2024. https://dthujs.vn/index.php/dthujs/article/view/1499.