@Misc{ 
  espfus,
  author = { Esposito, Luca and Fusco, Nicola },
  title = { A remark on a free interface problem with volume constraint },
  journal = {  },
  year = { 2008 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/574/ },
  note = { cvgmt preprint}
}