MOLLE, R.; PASSASEO, D. An elliptic problem with pointwise constraint on the laplacian. Topological Methods in Nonlinear Analysis, [S. l.], v. 8, n. 1, p. 1–23, 1996. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.1996.019. Acesso em: 22 jul. 2024.