@Misc{ 
  GalRit15,
  author = { Galli, Matteo and Ritoré, Manuel },
  title = { Regularity of $C^1$ surfaces with prescribed mean curvature in three-dimensional contact sub-Riemannian manifolds },
  journal = { Calc. Var. PDE },
  year = { 2015 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/2616/ },
  note = { cvgmt preprint}
}