@Misc{ 
  CaLiMoRo23,
  author = { Catino, Giovanni and Li, Yanyan and Monticelli, Dario D. and Roncoroni, Alberto },
  title = { A Liouville theorem in the Heisenberg Group },
  journal = {  },
  year = { 2023 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/6245/ },
  note = { cvgmt preprint}
}