HA, C.-W.; KUO, C.-C. On the solvability of a two point boundary value problem at resonance II. Topological Methods in Nonlinear Analysis, [S. l.], v. 11, n. 1, p. 159–168, 1998. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.1998.010. Acesso em: 22 jul. 2024.