@article{DA_1988_28_a8,
     author = {B. D. Tazhibaev},
     title = {Optimality conditions in a control problem},
     journal = {Diskretnyj analiz i issledovanie operacij},
     pages = {65--78},
     publisher = {mathdoc},
     number = {28},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DA_1988_28_a8/}
}