Generalized (∈, ∈ ∨qk)-Fuzzy Quasi-Ideals in Semigroups. Punjab University Journal of Mathematics, [S. l.], v. 50, n. 1, p. 33–51, 2018. Disponível em: https://pujm.pu.edu.pk/index.php/pujm/article/view/117. Acesso em: 28 jun. 2025.