@article{COCV_2009__15_4_810_0,
     author = {Ernst, Emil and Th\'era, Michel},
     title = {A converse to the {Lions-Stampacchia} theorem},
     journal = {ESAIM: Control, Optimisation and Calculus of Variations},
     pages = {810--817},
     publisher = {EDP-Sciences},
     volume = {15},
     number = {4},
     year = {2009},
     doi = {10.1051/cocv:2008054},
     mrnumber = {2567246},
     zbl = {1176.47050},
     language = {en},
     url = {http://www.numdam.org/articles/10.1051/cocv:2008054/}
}