BESHIMOV, R. B. Some cardinal properties of topological spaces connected with weakly density. Methods of Functional Analysis and Topology, [S. l.], v. 10, n. 3, p. 17–22, 2004. Disponível em: https://zen.imath.kiev.ua/index.php/mfat/article/view/249. Acesso em: 18 dec. 2025.