@Article{ 
  delgritil00,
  author = { De Lellis, Camillo and Grisanti, Carlo Romano and Tilli, Paolo },
  title = { Regular selection for multiple valued functions },
  journal = { Annali di Matematica Pura ed Applicata },
  year = { 2000 },
  volume = { 183 },
  pages = { 79-95 },
  URL = { http://cvgmt.sns.it/paper/570/ },
  note = { cvgmt preprint}
}