@Misc{ 
  Mon17,
  author = { Monti, Roberto },
  title = { Distances, boundaries and surface measures in Carnot-Caratheodory spaces },
  journal = {  },
  year = { 2001 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/3706/ },
  note = { cvgmt preprint}
}