JACOBSEN, Jon. Global bifurcation problems associated with $k$-Hessian operators. Topological Methods in Nonlinear Analysis, [S. l.], v. 14, n. 1, p. 81–130, 1999. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.1999.023. Acesso em: 24 dec. 2025.