CABRÉ, X.; CAFFARELLI, L. A. Regularity for viscosity solutions of fully nonlinear equations $F(D^2u) = 0$. Topological Methods in Nonlinear Analysis, [S. l.], v. 6, n. 1, p. 31–48, 1995. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.1995.030. Acesso em: 19 apr. 2024.