ANDRES, Jan; MALAGUTI, Luisa; PAVLAČKOVÁ, Martina. On second-order boundary value problems in Banach spaces: a bound sets approach. Topological Methods in Nonlinear Analysis, [S. l.], v. 37, n. 2, p. 303–341, 2011. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.2011.016. Acesso em: 8 jul. 2025.