CALDAS, Miguel. A separation axiom between semi-T° and semi-T1. Pro Mathematica, [S. l.], v. 11, n. 21-22, p. 89–96, 1997. Disponível em: https://revistas.pucp.edu.pe/index.php/promathematica/article/view/6090. Acesso em: 12 dic. 2025.