@Misc{ 
  BreLeD12,
  author = { Breuillard, Emmanuel and Le Donne, Enrico },
  title = { On the rate of convergence to the asymptotic cone for nilpotent groups
  and subFinsler geometry },
  journal = {  },
  year = { 2012 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/4165/ },
  note = { cvgmt preprint}
}