DIAZ, L.; NAULIN, R. Discrete Systems with Advanced Argument. CUBO, A Mathematical Journal, [S. l.], v. 4, n. 1, p. 396–407, 2002. Disponível em: https://www.perspectivasdelacomunicacion.cl/ojs/index.php/cubo/article/view/1738. Acesso em: 20 may. 2024.