Nguyen, Hoa, Nguyen Thi Uyen Nhi, and Le Nhat Duy. “FUZZY RELATIONAL DATABASE MODEL AND MANAGEMANT SYSTEM FOR IMPRECISE INFORMATION”. Journal of Computer Science and Cybernetics 37, no. 2 (May 31, 2021): 145–162. Accessed May 5, 2024. https://vjs.ac.vn/index.php/jcc/article/view/15346.