Trinh Thi Nhi, and Nguyen Ba Tuong. “DEPENDENCES ATTRIBUTES OF INFORMATION SYSTEMS AND PROPERTIES OF UPPER APPROXIMATION BASED CLOSE FUNCCTION.”. UTEHY Journal of Applied Science and Technology 10 (April 19, 2020): 69-72. Accessed December 28, 2024. http://jst.utehy.edu.vn/index.php/jst/article/view/285.