@article{ASNSP_2004_5_3_4_871_0,
     author = {Kirchheim, Bernd and Serra Cassano, Francesco},
     title = {Rectifiability and parameterization of intrinsic regular surfaces in the {Heisenberg} group},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {871--896},
     publisher = {Scuola Normale Superiore, Pisa},
     volume = {Ser. 5, 3},
     number = {4},
     year = {2004},
     mrnumber = {2124590},
     zbl = {1170.28300},
     language = {en},
     url = {http://www.numdam.org/item/ASNSP_2004_5_3_4_871_0/}
}