BIESKE, Thomas. Equivalence of weak and viscosity solutions to the p-Laplace equation in the Heisenberg group. Annales Fennici Mathematici, [S. l.], v. 31, n. 2, p. 363–379, 2006. Disponível em: https://afm.journal.fi/article/view/135165. Acesso em: 8 apr. 2026.