SACCON, C. Multiplicity of bifurcation points for variational inequalities via Conley index. Topological Methods in Nonlinear Analysis, [S. l.], v. 11, n. 1, p. 83–102, 1998. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.1998.005. Acesso em: 21 feb. 2024.