@Misc{ 
  FarVal13,
  author = { Farina, Alberto and Valdinoci, Enrico },
  title = { Gradient bounds for anisotropic partial differential equations },
  journal = { Calc. Var. and PDE },
  year = { 2013 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/2099/ },
  note = { cvgmt preprint}
}