ZHANG, C. J.; CHO, Y. J.; WEI, S. M. Variational inequalities and surjectivity for set-valued monotone mappings. Topological Methods in Nonlinear Analysis, [S. l.], v. 12, n. 1, p. 169–178, 1998. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.1998.035. Acesso em: 22 jul. 2024.