@article{ASNSP_2003_5_2_4_847_0,
     author = {Balogh, Zolt\'an M. and Rickly, Matthieu},
     title = {Regularity of convex functions on {Heisenberg} groups},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {847--868},
     publisher = {Scuola normale superiore},
     volume = {Ser. 5, 2},
     number = {4},
     year = {2003},
     mrnumber = {2040646},
     zbl = {1121.43007},
     language = {en},
     url = {http://www.numdam.org/item/ASNSP_2003_5_2_4_847_0/}
}