AKRAM, M.; DUDEK, W.A.; SARWAR, S. PROPERTIES OF BIPOLAR FUZZY HYPERGRAPHS. Italian Journal of Pure and Applied Mathematics, [S. l.], v. 31, p. 141–160, 2013. Disponível em: https://journals.uniurb.it/index.php/ijpam/article/view/6154. Acesso em: 26 jul. 2026.