@Misc{ 
  AgrRizRos21,
  author = { Agrachev, Andrei and Rizzi, Luca and Rossi, Tommaso },
  title = { Relative heat content asymptotics for sub-Riemannian manifolds },
  journal = {  },
  year = { 2021 },
  pages = { 44 },
  URL = { http://cvgmt.sns.it/paper/5296/ },
  note = { cvgmt preprint}
}