@Article{ 
  ele07,
  author = { Eleuteri, Michela },
  title = { Regularity results for a class of obstacle problems },
  journal = { Appl. Math. },
  year = { 2007 },
  volume = { 52 },
  number = { 2 },
  pages = { 137-169 },
  URL = { http://cvgmt.sns.it/paper/1399/ },
  note = { cvgmt preprint}
}