@Misc{ 
  gig,
  author = { Gigli, Nicola },
  title = { On the geometry of the space of probability measures endowed with the quadratic optimal transport distance },
  journal = {  },
  year = { 2008 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/491/ },
  note = { cvgmt preprint}
}