@Misc{ 
  FarVal16,
  author = { Farina, Alberto and Valdinoci, Enrico },
  title = { REGULARITY AND RIGIDITY THEOREMS FOR A CLASS OF ANISOTROPIC NONLOCAL OPERATORS },
  journal = {  },
  year = { 2016 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/2903/ },
  note = { cvgmt preprint}
}