Đức, Nguyễn Mạnh, and Đặng Văn Đức. “On the Method Refinement for Models of UML”. Journal of Computer Science and Cybernetics 22, no. 1 (July 23, 2012): 63–74. Accessed May 2, 2024. https://vjs.ac.vn/index.php/jcc/article/view/1394.