INSALL, Matt. Substitutions of the Independent Variable in Linear Differential Equations. CUBO, A Mathematical Journal, [S. l.], v. 5, n. 3, p. 109–122, 2003. Disponível em: https://cubo.ufro.cl/index.php/cubo/article/view/1669. Acesso em: 12 oct. 2025.