KRYLOV, N. V. Hölder continuity and $L_p$ estimates for elliptic equations under general Hörmander’s condition. Topological Methods in Nonlinear Analysis, [S. l.], v. 9, n. 2, p. 249–258, 1997. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.1997.012. Acesso em: 22 lip. 2024.