KIKINA, L. K.; STAVROULAKIS, I.P. A Survey on the Oscillation of Solutions of First Order Delay Difference Equations. CUBO, A Mathematical Journal, [S. l.], v. 7, n. 2, p. 223–236, 2005. Disponível em: https://cubo.ufro.cl/index.php/cubo/article/view/1550. Acesso em: 12 oct. 2025.