@Misc{ 
  gig11,
  author = { Gigli, Nicola },
  title = { Optimal maps in non branching spaces with Ricci curvature bounded from below },
  journal = {  },
  year = { 2011 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/413/ },
  note = { cvgmt preprint}
}