@Article{ 
  dongre01,
  author = { D'Onofrio, Luigi and Greco, Luigi },
  title = { On the Regularity of Solutions to a Nonvariational Elliptic Equation },
  journal = { Annales de la Faculte des Sciences de Tolouse },
  year = { 2002 },
  volume = { XI },
  number = { 1 },
  pages = { 47-56 },
  URL = { http://cvgmt.sns.it/paper/547/ },
  note = { cvgmt preprint}
}