@Article{ 
  BarRiz12,
  author = { Barilari, Davide and Rizzi, Luca },
  title = { A formula for Popp's volume in sub-Riemannian geometry },
  journal = { Analysis and Geometry in Metric Spaces },
  year = { 2013 },
  doi = { 10.2478/agms-2012-0004 },
  volume = { 1 },
  pages = { 42-57 },
  URL = { http://cvgmt.sns.it/paper/2023/ },
  note = { cvgmt preprint}
}