@article{10_1090_S0894_0347_01_00376_9,
     author = {Caffarelli, Luis and Feldman, Mikhail and McCann, Robert},
     title = {Constructing optimal maps for {Monge{\textquoteright}s} transport problem as a limit of strictly convex costs},
     journal = {Journal of the American Mathematical Society},
     pages = {1--26},
     year = {2002},
     volume = {15},
     number = {1},
     doi = {10.1090/S0894-0347-01-00376-9},
     url = {http://geodesic.mathdoc.fr/articles/10.1090/S0894-0347-01-00376-9/}
}