AMSTER, P.; KUNA, M. P. On exact multiplicity for a second order equation with radiation boundary conditions. Topological Methods in Nonlinear Analysis, [S. l.], v. 54, n. 1, p. 233–246, 2019. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.2019.039. Acesso em: 22 jul. 2024.