@Misc{ 
  Sca20,
  author = { Scattaglia, Vincenzo },
  title = { A formula for the minimal perimeter of clusters with density },
  journal = {  },
  year = { 2020 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/4948/ },
  note = { cvgmt preprint}
}