@article{DAN_1976_227_1_a5,
     author = {Yu. P. Krivenkov},
     title = {Necessary optimality conditions for an optimal problem with operator criterion and constraints},
     journal = {Doklady Akademii Nauk},
     pages = {29--32},
     publisher = {mathdoc},
     volume = {227},
     number = {1},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1976_227_1_a5/}
}