@Misc{ 
  FerPin12,
  author = { Ferrari, Fausto and Pinamonti, Andrea },
  title = { Nonexistence results for semilinear equations in Carnot groups },
  journal = {  Analysis and Geometry in Metric Spaces },
  year = { 2012 },
  doi = { doi: 10.2478/agms-2013-0001 },
  pages = { 130-146 },
  URL = { http://cvgmt.sns.it/paper/2010/ },
  note = { cvgmt preprint}
}