MARGHERI, A.; ZECCA, P. Solution sets and boundary value problems in Banach spaces. Topological Methods in Nonlinear Analysis, [S. l.], v. 2, n. 1, p. 179–188, 1993. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.1993.037. Acesso em: 20 apr. 2024.