GRANAS, A.; FRIGON, M. Schauder’s Theorem and the method of a priori bounds. Topological Methods in Nonlinear Analysis, [S. l.], v. 52, n. 1, p. 99–109, 2018. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.2017.053. Acesso em: 18 lip. 2024.