@Misc{ 
  BarBos23,
  author = { Barilari, Davide and Bossio, Tania },
  title = { Steiner and tube formulae in 3D contact sub-Riemannian geometry },
  journal = { Communication in Contemporary Mathematics },
  year = { 2023 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/5897/ },
  note = { cvgmt preprint}
}