LIU, F.-C. Measure solutions of systems of inequalities. Topological Methods in Nonlinear Analysis, [S. l.], v. 2, n. 2, p. 317–331, 1993. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.1993.045. Acesso em: 22 jul. 2024.