Optimal control of obstacle problems : existence of Lagrange multipliers
ESAIM: Control, Optimisation and Calculus of Variations, Tome 5 (2000), pp. 45-70. 
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     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/}
}
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Bergounioux, Maïtine; Mignot, Fulbert. Optimal control of obstacle problems : existence of Lagrange multipliers. ESAIM: Control, Optimisation and Calculus of Variations, Tome 5 (2000), pp. 45-70. http://www.numdam.org/item/COCV_2000__5__45_0/

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