@Misc{ 
  BruMarRau13,
  author = { Franchi, Bruno and Marchi, Marco and Serapioni, Raul },
  title = { Intrinsic Lipschitz Graphs Within Carnot Groups },
  journal = {  },
  year = { 2013 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/2134/ },
  note = { cvgmt preprint}
}