@Misc{ 
  MarDeP14,
  author = { De Philippis, Guido and Marini, Michele },
  title = { A note on Petty's Theorem },
  journal = { Kodai  Mathematical Journal },
  year = { 2014 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/2404/ },
  note = { cvgmt preprint}
}