@Misc{ 
  figvil08,
  author = { Figalli, Alessio and Villani, Cédric },
  title = { Optimal Transport and Curvature },
  journal = {  },
  year = { 2008 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/380/ },
  note = { cvgmt preprint}
}