1. Multiproduct nonlinear pricing;Armstrong;Econometrica,1996
2. Polar factorization and monotone rearrangements of vector valued functions;Brenier;Communications in Pure Applied Mathematics,1991
3. Brézis, H., 1984. Analyse Fonctionnelle Théorie et Applications. Masson, Paris.
4. Minimum problems over sets of concave functions and related questions;Butazzo;Mathematics Nachrichten,1993
5. Carlier, G., 2000a. Calculus of variations for non-decreasing functions, mimeo.