Thi, Vũ Đức, and Nguyễn Hoàng Sơn. “The Dense Families of Relation Schemes and Its Application”. Journal of Computer Science and Cybernetics 25, no. 2 (April 27, 2012): 125–134. Accessed May 7, 2024. https://vjs.ac.vn/index.php/jcc/article/view/565.