FERRARI, Fausto; VECCHI, Eugenio. Hölder behavior of viscosity solutions of some fully nonlinear equations in the Heisenberg group. Topological Methods in Nonlinear Analysis, [S. l.], v. 55, n. 1, p. 227–242, 2020. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.2019.073. Acesso em: 8 jul. 2025.