Some Closure Operators and Topologies on a Hyper BCK-algebra. European Journal of Pure and Applied Mathematics, Maryland, USA, v. 13, n. 1, p. 1–8, 2020. DOI: 10.29020/nybg.ejpam.v13i1.3632. Disponível em: https://www.ejpam.com/index.php/ejpam/article/view/3632.. Acesso em: 29 apr. 2024.