Vinh, Lê Xuân, and Trần Thiên Thành. “Some Problems on Multivalued Dependencies in Fuzzy Databases With Linguistic Data”. Journal of Computer Science and Cybernetics 28, no. 1 (June 21, 2012): 89–102. Accessed April 9, 2025. https://vjs.ac.vn/index.php/jcc/article/view/1067.