Thanh, Lê, Nguyễn Văn Ngọc, and Nguyễn Thúc Hải. “Role Hierarchies for Temporal Constraint Role-Based Access Control Model”. Journal of Computer Science and Cybernetics 21, no. 3 (July 10, 2012): 230–243. Accessed November 23, 2024. https://vjs.ac.vn/index.php/jcc/article/view/1247.