@Misc{ 
  CinTan14,
  author = { Cinti, Eleonora and Tan, Jinggang },
  title = { A NONLINEAR LIOUVILLE THEOREM FOR FRACTIONAL EQUATIONS IN THE HEISENBERG GROUP },
  journal = { Journal of Math. Analysis and Appl. },
  year = { 2014 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/2463/ },
  note = { cvgmt preprint}
}