CAPONETTI, D.; TROMBETTA, A.; TROMBETTA, G. Proper $k$-ball-contractive mappings in $C_b^m[0, + \infty)$. Topological Methods in Nonlinear Analysis, [S. l.], v. 58, n. 2, p. 609–639, 2021. DOI: 10.12775/TMNA.2021.017. Disponível em: https://apcz.umk.pl/TMNA/article/view/36494. Acesso em: 4 may. 2024.