@Article{ 
  gresbo00,
  author = { Greco, Luigi and Sbordone, Carlo },
  title = { Sharp Upper Bounds for the Degree of Regularity of the Solutions to an Elliptic Equation },
  journal = { Communications in PDE },
  year = { 2002 },
  volume = { 27 },
  number = { 5\&6 },
  pages = { 945-952 },
  URL = { http://cvgmt.sns.it/paper/1533/ },
  note = { cvgmt preprint}
}