BIRINDELLI, Isabeau; GIACOMONI, Jacques. Bifurcation problems for superlinear elliptic indefinite equations. Topological Methods in Nonlinear Analysis, [S. l.], v. 16, n. 1, p. 17–36, 2000. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.2000.028. Acesso em: 8 jul. 2025.