@Misc{ 
  BjoCafFig12,
  author = { Bjorland, Clayton and Caffarelli, Luis and Figalli, Alessio },
  title = { Non-Local Gradient Dependent Operators },
  journal = { Adv. Math. },
  year = { 2012 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/1811/ },
  note = { cvgmt preprint}
}