@article{COCV_2000__5__45_0,
     author = {Bergounioux, Ma{\"\i}tine and Mignot, Fulbert},
     title = {Optimal control of obstacle problems : existence of {Lagrange} multipliers},
     journal = {ESAIM: Control, Optimisation and Calculus of Variations},
     pages = {45--70},
     publisher = {EDP-Sciences},
     volume = {5},
     year = {2000},
     mrnumber = {1745686},
     zbl = {0934.49008},
     language = {en},
     url = {http://www.numdam.org/item/COCV_2000__5__45_0/}
}