@article{COCV_2005__11_1_57_0,
     author = {Ekeland, Ivar},
     title = {An optimal matching problem},
     journal = {ESAIM: Control, Optimisation and Calculus of Variations},
     pages = {57--71},
     publisher = {EDP-Sciences},
     volume = {11},
     number = {1},
     year = {2005},
     doi = {10.1051/cocv:2004034},
     mrnumber = {2110613},
     zbl = {1106.49054},
     language = {en},
     url = {http://www.numdam.org/articles/10.1051/cocv:2004034/}
}