PETRUS¸EL, Adrian; RUS, Ioan A.; S¸ERBAN, Marcel Adrian. Fixed Points for Operators on Generalized Metric Spaces. CUBO, A Mathematical Journal, [S. l.], v. 10, n. 4, p. 45–66, 2008. Disponível em: https://cubo.ufro.cl/index.php/cubo/article/view/1487. Acesso em: 7 dec. 2025.