@Misc{ 
  DipPin12,
  author = { Dipierro, Serena and Pinamonti, Andrea },
  title = { A geometric inequality and a symmetry result for elliptic systems involving the fractional Laplacian },
  journal = { Journal of Differential Equations },
  year = { 2013 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/2025/ },
  note = { cvgmt preprint}
}