@article{PS_2012__16__306_0,
     author = {Beiglb\"ock, Mathias and L\'eonard, Christian and Schachermayer, Walter},
     title = {A generalized dual maximizer for the {Monge-Kantorovich} transport problem},
     journal = {ESAIM: Probability and Statistics},
     pages = {306--323},
     publisher = {EDP-Sciences},
     volume = {16},
     year = {2012},
     doi = {10.1051/ps/2011163},
     mrnumber = {2956577},
     zbl = {1263.49057},
     language = {en},
     url = {http://www.numdam.org/articles/10.1051/ps/2011163/}
}