SALAS BROWN, Margot; ROSAS, Ennis; CARPINTERO, Carlos. Generalized closed sets via ideals and operator. Pro Mathematica, [S. l.], v. 23, n. 45-46, p. 127–146, 2009. Disponível em: https://revistas.pucp.edu.pe/index.php/promathematica/article/view/10268. Acesso em: 11 dic. 2025.