@Misc{ 
  BouBra16,
  author = { Bousquet, Pierre and Brasco, Lorenzo },
  title = { $C^1$ regularity of orthotropic $p-$harmonic functions in the plane },
  journal = { Anal. PDE },
  year = { 2016 },
  pages = { 42 },
  URL = { http://cvgmt.sns.it/paper/3113/ },
  note = { cvgmt preprint}
}