@Misc{ 
  LerMon15,
  author = { Lerario, Antonio and Mondino, Andrea },
  title = { Homotopy properties of horizontal loop spaces and applications to closed sub-riemannian geodesics },
  journal = { Transactions of the American Math Society, Series B. },
  year = { 2015 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/2797/ },
  note = { cvgmt preprint}
}