Ordered semigroups containing covered (m,n)-ideals. Gulf Journal of Mathematics, [S. l.], v. 19, n. 1, p. 169–177, 2025. DOI: 10.56947/gjom.v19i1.2537. Disponível em: https://gjom.org/index.php/gjom/article/view/2537. Acesso em: 26 aug. 2026.