DAVVAZ, Bijan; VICEDO, Ann Leslie O.; VILELA, Jocelyn P. FUZZY HYPER KS-SEMIGROUPS. Italian Journal of Pure and Applied Mathematics, [S. l.], v. 34, p. 243–250, 2015. Disponível em: https://journals.uniurb.it/index.php/ijpam/article/view/6356. Acesso em: 7 aug. 2026.