FATTAHI, Z.; ERFANIAN, A.; AZIMI, A. A BIPARTITE GRAPH ASSOCIATED TO A BI-MODULE OF A RING. Italian Journal of Pure and Applied Mathematics, [S. l.], v. 40, p. 157–163, 2018. Disponível em: https://journals.uniurb.it/index.php/ijpam/article/view/7042. Acesso em: 17 oct. 2026.