THI, V. D. On the Hypergraphs and candidate keys. Journal of Computer Science and Cybernetics, [S. l.], v. 13, n. 4, p. 98–102, 2016. DOI: 10.15625/1813-9663/13/4/8038. Disponível em: https://vjs.ac.vn/index.php/jcc/article/view/8038. Acesso em: 21 nov. 2024.