@Misc{ 
  nicsco02,
  author = { Garofalo, Nicola and Pauls, Scott },
  title = { The Bernstein problem in the Heisenberg group },
  journal = {  },
  year = { 2002 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/265/ },
  note = { cvgmt preprint}
}