CALDAS, Miguel; JAFARI, Saeid; LATIF, R. M. ? - open sets and a new class of functions. Pro Mathematica, [S. l.], v. 23, n. 45-46, p. 155–174, 2009. Disponível em: https://revistas.pucp.edu.pe/index.php/promathematica/article/view/10270. Acesso em: 16 dic. 2025.