@article{DAN_1980_254_5_a11,
     author = {B. Mordukhovich},
     title = {Metric approximations and necessary optimality conditions for general classes of nonsmooth extremal problems},
     journal = {Doklady Akademii Nauk},
     pages = {1072--1076},
     publisher = {mathdoc},
     volume = {254},
     number = {5},
     year = {1980},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1980_254_5_a11/}
}