Topologies on a Hyper Sum and Hyper Product of Two Hyper BCK-algebras. European Journal of Pure and Applied Mathematics, Maryland, USA, v. 12, n. 4, p. 1524–1532, 2019. DOI: 10.29020/nybg.ejpam.v12i4.3559. Disponível em: https://www.ejpam.com/index.php/ejpam/article/view/3559.. Acesso em: 29 apr. 2024.