@article{DAN_1984_276_3_a6,
     author = {Yu. S. Ledyaev},
     title = {Theorems on an implicitly given set-valued mapping},
     journal = {Doklady Akademii Nauk},
     pages = {543--546},
     year = {1984},
     volume = {276},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1984_276_3_a6/}
}