Continuous dependence estimates for viscosity solutions of fully nonlinear degenerate elliptic equations. Jakobsen, Espen R., Karlsen, Kenneth H. (2002) Electronic Journal of Differential Equations (EJDE) [electronic only]
Convex functions on Carnot groups. P. Juutinen, G. Lu, J. J. Manfredi, B. Stroffolini (2007) Revista Matemática Iberoamericana
Corner Mellin operators and conormal asymptotics B.-W. Schulze (1990/1991) Séminaire Équations aux dérivées partielles (Polytechnique)
Correction to the paper: C 1 , α local regularity for the solutions of the p-Laplacian on the Heisenberg group. The case 1 + 1 5 < p ≤ 2 Silvana Marchi (2003) Commentationes Mathematicae Universitatis Carolinae
Criteria for hypoellipticity Y. Morimoto (1986/1987) Séminaire Équations aux dérivées partielles (Polytechnique)