PHANTHAWIMOL, W.; KEMPRASIT, Y. HOMOMORPHISMS AND EPIMORPHISMS OF SOME HYPERGROUPS. Italian Journal of Pure and Applied Mathematics, [S. l.], v. 27, p. 305–312, 2010. Disponível em: https://journals.uniurb.it/index.php/ijpam/article/view/5817. Acesso em: 18 may. 2026.