@Misc{ 
  DucA.C7,
  author = { A. C. Mennucci,  and Duci, A. },
  title = { Banach-like metrics and metrics of compact sets },
  journal = {  },
  year = { 2007 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/5442/ },
  note = { cvgmt preprint}
}