@Misc{ 
  LeD8,
  author = { Le Donne, Enrico },
  title = { Doubling property for biLipschitz homogeneous geodesic surfaces },
  journal = {  },
  year = { 2008 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/4170/ },
  note = { cvgmt preprint}
}