THIVAGAR, M. L.; PONMANI, S. A. Another form of separation axioms. Methods of Functional Analysis and Topology, [S. l.], v. 13, n. 4, p. 380–385, 2007. Disponível em: https://zen.imath.kiev.ua/index.php/mfat/article/view/363. Acesso em: 16 dec. 2025.