1. Ambrosio, L.: Lecture Notes on Optimal Transfer Problems, preprint
2. Ambrosio, L.: Optimal transport maps in Monge-Kantorovich problem. ICM 3, 1–3 (2002)
3. Bourgain, J., Brezis, H.: Sur l’équation div
$$u=f$$
. C. R. Acad. Sci. Paris, Ser. I334, 973–976 (2002)
4. Caffarelli, L.A.: Allocation maps with general cost functions, in partial differential equations and applications. Lect. Notes Pure Appl. Math. 177, 29–35 (1996)
5. Caffarelli, L.A., Feldman, M., MCcann, R.J.: Constructing optimal maps for Monge’s transport problem as a limit of strictly convex costs. J. AMS 15, 1–26 (2001)