@Article{ 
  BarBosNee12,
  author = { Barilari, Davide and Boscain, Ugo and Neel, Robert W. },
  title = { Small time heat kernel asymptotics at the sub-Riemannian cut locus },
  journal = { Journal of Differential Geometry },
  year = { 2012 },
  volume = { 92 },
  number = { 3 },
  pages = { 373-416 },
  URL = { http://cvgmt.sns.it/paper/1823/ },
  note = { cvgmt preprint}
}