ISAC, George. The Fold complementarity problem and the order complementarity problem. Topological Methods in Nonlinear Analysis, [S. l.], v. 8, n. 2, p. 343–358, 1996. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.1996.038. Acesso em: 8 jul. 2025.