@Article{ 
  BarPao15,
  author = { Barilari, Davide and Paoli, Elisa },
  title = { Curvature terms in small time heat kernel expansion for a model class of hypoelliptic Hörmander operators },
  journal = { Nonlinear Analysis },
  year = { 2015 },
  pages = { 17 },
  URL = { http://cvgmt.sns.it/paper/2825/ },
  note = { cvgmt preprint}
}