@Misc{ 
  figloe,
  author = { Figalli, Alessio and Loeper, Grégoire },
  title = { $C^1$ regularity of solutions of the Monge-Ampère equation for optimal transport in dimension two },
  journal = { Calc. Var. Partial Differential Equations },
  year = { 2008 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/1593/ },
  note = { cvgmt preprint}
}