@Misc{ 
  butvarzou04,
  author = { Buttazzo, Giuseppe and Varchon, Nicolas and Zoubairi, Hakima },
  title = { Optimal measures for elliptic problems },
  journal = { Annali Mat. Pur. Appl. },
  year = { 2004 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/1403/ },
  note = { cvgmt preprint}
}