@Misc{ DePFig13a, author = { De Philippis, Guido and Figalli, Alessio }, title = { The Monge-Ampère equation and its link to optimal transportation }, journal = { Bull. Amer. Math. Soc. }, year = { 2014 }, pages = { }, URL = { http://cvgmt.sns.it/paper/2262/ }, note = { cvgmt preprint} }