Thi, Vũ Đức, and Nguyễn Hoàng Sơn. “Desribing Minimal Keys by Dense Families of Database Relations”. <i>Journal of Computer Science and Cybernetics</i> 21, no. 2 (July 24, 2012): 130–136. Accessed November 4, 2025. https://jcc.vast.vn/jcc/article/view/1444.