KEHAYOPULU, Niovi. Fuzzy Right (Left) Ideals in Hypergroupoids and Fuzzy Bi-ideals in Hypersemigroups. Armenian Journal of Mathematics, Yerevan, Armenia, v. 10, n. 3, p. 1–10, 2018. Disponível em: https://armjmath.sci.am/index.php/ajm/article/view/196. Acesso em: 3 apr. 2025.