@Misc{ 
  figrif09a,
  author = { Figalli, Alessio and Rifford, Ludovic },
  title = { Continuity of optimal transport maps and convexity of injectivity domains on small deformations of S^2 },
  journal = { Comm. Pure Appl. Math. },
  year = { 2009 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/861/ },
  note = { cvgmt preprint}
}