@Misc{ 
  bigser09,
  author = { Bigolin, Francesco and Serra Cassano, Francesco },
  title = { Distributional solutions of Burgers' equation and intrinsic regular graphs in Heisenberg groups },
  journal = { JMAA },
  year = { 2009 },
  pages = { 11 },
  URL = { http://cvgmt.sns.it/paper/324/ },
  note = { cvgmt preprint}
}