ZULFIQAR, M.; SHABIR, M. Characterizations of (∈, ∈ ∨ q) -interval valued fuzzy H-ideals in BCK-algebras. Kuwait Journal of Science, [S. l.], v. 42, n. 2, 2015. Disponível em: https://journals.ku.edu.kw/kjs/index.php/KJS/article/view/45. Acesso em: 6 may. 2026.