@article{DAN_1993_328_1_a1,
     author = {E. N. Devdariani and Yu. S. Ledyaev},
     title = {Optimality conditions for implicit controlled systems},
     journal = {Doklady Akademii Nauk},
     pages = {11--15},
     publisher = {mathdoc},
     volume = {328},
     number = {1},
     year = {1993},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1993_328_1_a1/}
}