Sơn, Nguyễn Hoàng, and Nguyễn Việt Hùng. “Translation of Relation Schemes”. Journal of Computer Science and Cybernetics 18, no. 3 (July 29, 2012): 285–289. Accessed May 13, 2024. https://vjs.ac.vn/index.php/jcc/article/view/1592.