Thi, Vũ Đức, and Lương Cao Sơn. “On the Boyce - Codd Normal Form for Relation Scheme”. Journal of Computer Science and Cybernetics 16, no. 1 (April 1, 2013): 15–17. Accessed April 28, 2025. https://vjs.ac.vn/jcc/article/view/2846.