@Misc{ 
  Pas12,
  author = { Passarelli di Napoli, Antonia },
  title = { Higher differentiability of minimizers of variational integrals with Sobolev coeffcients },
  journal = { Advances in Calculus of Variations },
  year = { 2012 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/1999/ },
  note = { cvgmt preprint}
}