THI, V. D.; SON, N. H. On the dense families of database relations. Journal of Computer Science and Cybernetics, [S. l.], v. 24, n. 1, p. 3–11, 2012. DOI: 10.15625/1813-9663/24/1/1223. Disponível em: https://vjs.ac.vn/index.php/jcc/article/view/1223. Acesso em: 1 may. 2024.