DAVVAZ, B.; SADRABADI, E. H. On Atanassov’s intuitionistic fuzzy grade of the direct product of two hypergroupoids. Kuwait Journal of Science, [S. l.], v. 41, n. 3, 2014. Disponível em: https://journalskuwait.org/kjs/index.php/KJS/article/view/689. Acesso em: 1 may. 2026.