@article{DAN_1987_295_5_a5,
     author = {B. Sh. Mordukhovich},
     title = {Approximation methods and extremum conditions in nonsmooth control},
     journal = {Doklady Akademii Nauk},
     pages = {1053--1057},
     publisher = {mathdoc},
     volume = {295},
     number = {5},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1987_295_5_a5/}
}