References
- Danielli , D , Garofalo , N and Nhieu , DM . 2003 . Notions of convexity in Carnot groups . Communications in Analysis and Geometry , 11 : 263 – 341 .
- Garofalo , N and Tournier , F . 2006 . New properties of convex functions in the Heisenberg group . Trans. Amer. Math. Soc. , 358 : 2011 – 2055 .
- Gutiérrez , C and Montanari , A . 2004 . Maximum and comparison principles for convex functions on the Heisenberg group . Communications Partial Differential Equations , 29 ( 9–10 ) : 1305 – 1334 .
- Gutiérrez , CE and Montanari , A . 2004 . On the second order derivatives of convex functions on the Heisenberg group . Annali della Scuola Normale Superiore di Pisa. Classe di Scienze. Serie V , 3 ( 2 ) : 349 – 366 .
- Juutinen , P , Lu , G , Manfredi , JJ and Stroffolini , B . Convex functions of Carnot groups (To appear in Revista Matematica Iberoamericana)
- Lu , G , Manfredi , JJ and Stroffolini , B . 2004 . Convex functions on Heisenberg group . Calculus of Variations , 19 : 1 – 22 .
- Magnani , V . 2006 . Lipschitz continuity, Alexandrov theorem and characterizations for H-convex functions . Math. Annalen , 334 : 199 – 233 .