Finiteness Conditions For Union of Two Finite Semigroups and Upper Rank of B(G; n). European Journal of Pure and Applied Mathematics, Maryland, USA, v. 6, n. 3, p. 335–339, 2017. Disponível em: https://www.ejpam.com/index.php/ejpam/article/view/1809. Acesso em: 22 dec. 2024.