GATICA, J. A. Fixed Point Theorems with Applications to Differential Equations. CUBO, A Mathematical Journal, [S. l.], v. 2, n. 1, p. 193–205, 2000. Disponível em: https://cubo.ufro.cl/ojs/index.php/cubo/article/view/1771. Acesso em: 20 may. 2024.