@article{CMUC_1991__32_2_a8,
     author = {Papageorgiou, Nikolaos S.},
     title = {An existence theorem for a class of nonlinear  elliptic optimal control problems},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {273--279},
     publisher = {mathdoc},
     volume = {32},
     number = {2},
     year = {1991},
     mrnumber = {1137788},
     zbl = {0752.49005},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1991__32_2_a8/}
}