@Misc{ figrifvil11a, author = { Figalli, Alessio and Rifford, Ludovic and Villani, Cédric }, title = { Necessary and sufficient conditions for continuity of optimal transport maps on Riemannian manifolds }, journal = { Tohoku Math. J. }, year = { 2011 }, pages = { }, URL = { http://cvgmt.sns.it/paper/721/ }, note = { cvgmt preprint} }