THI, V. Đức; SƠN, N. H. Desribing minimal keys by dense families of database relations. Journal of Computer Science and Cybernetics, [S. l.], v. 21, n. 2, p. 130–136, 2012. DOI: 10.15625/1813-9663/21/2/1444. Disponível em: https://vjs.ac.vn/index.php/jcc/article/view/1444. Acesso em: 3 may. 2024.