Regularity of the transformation semigroups with invariant sets and restricted by an equivalence relation. Gulf Journal of Mathematics, [S. l.], v. 20, n. 2, p. 194–202, 2025. DOI: 10.56947/gjom.v20i2.3191. Disponível em: https://gjom.org/index.php/gjom/article/view/3191. Acesso em: 25 aug. 2026.