DAVVAZ, Bijan; VICEDO, Ann Leslie O.; VILELA, Jocelyn P. SOME STRUCTURAL PROPERTIES OF HYPER KS-SEMIGROUPS. Italian Journal of Pure and Applied Mathematics, [S. l.], v. 33, p. 319–332, 2014. Disponível em: https://journals.uniurb.it/index.php/ijpam/article/view/6287. Acesso em: 7 aug. 2026.