@Misc{ 
  PinGar16,
  author = { Pinamonti, Andrea and Speight, Gareth },
  title = { Structure of Porous Sets in Carnot Groups },
  journal = {  },
  year = { 2016 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/3114/ },
  note = { cvgmt preprint}
}