SHIBATA, T. Variational eigencurve and bifurcation for two-parameter nonlinear Sturm-Liouville equations. Topological Methods in Nonlinear Analysis, [S. l.], v. 8, n. 1, p. 79–93, 1996. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.1996.022. Acesso em: 22 jul. 2024.