@Article{ 
  VedSer19,
  author = { Serra Cassano, Francesco and Vedovato, Mattia },
  title = { The Bernstein problem in Heisenberg groups },
  journal = { Le Matematiche },
  year = { 2020 },
  volume = { 75 },
  number = { 1 },
  pages = { 377-403 },
  URL = { http://cvgmt.sns.it/paper/4536/ },
  note = { cvgmt preprint}
}