YARAHMADI, Zahra; ASHRAFI, Ali Reza. ON CHARACTERISTIC SUBGRAPH OF A GRAPH. Italian Journal of Pure and Applied Mathematics, [S. l.], v. 33, p. 101–106, 2014. Disponível em: https://journals.uniurb.it/index.php/ijpam/article/view/6289. Acesso em: 7 aug. 2026.