LEWIS, J. L.; NYSTRÖM, K. Regularity and free boundary regularity for the p Laplacian in Lipschitz and C1 domains. Annales Fennici Mathematici, [S. l.], v. 33, n. 2, p. 523–548, 2008. Disponível em: https://afm.journal.fi/article/view/135245. Acesso em: 21 may. 2024.