@Misc{ 
  HasKok14,
  author = { Hassannezhad, Asma and Kokarev, Gerasim },
  title = { Sub-Laplacian eigenvalue bounds on sub-Riemannian manifolds },
  journal = {  },
  year = { 2014 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/4934/ },
  note = { cvgmt preprint}
}