BURNAT, M. Solutions with shocks in several variables. Topological Methods in Nonlinear Analysis, [S. l.], v. 6, n. 1, p. 97–126, 1995. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.1995.034. Acesso em: 14 oct. 2024.