On β-Open Sets and Ideals in Topological Spaces. European Journal of Pure and Applied Mathematics, Maryland, USA, v. 12, n. 3, p. 893–905, 2019. DOI: 10.29020/nybg.ejpam.v12i3.3438. Disponível em: https://www.ejpam.com/index.php/ejpam/article/view/3438.. Acesso em: 29 apr. 2024.