FURUMOCHI, Tetsuo. Periodic Solutions of Periodic Difference Equations by Schauder‘s Theorem. CUBO, A Mathematical Journal, [S. l.], v. 11, n. 3, p. 55–63, 2009. Disponível em: https://cubo.ufro.cl/index.php/cubo/article/view/1462. Acesso em: 4 mar. 2026.