@article{DAN_1978_242_1_a9,
     author = {A. G. Kusraev},
     title = {On necessary conditions for an extremum of nonsmooth vector-valued mappings},
     journal = {Doklady Akademii Nauk},
     pages = {44--47},
     publisher = {mathdoc},
     volume = {242},
     number = {1},
     year = {1978},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1978_242_1_a9/}
}