@article{DAN_1978_242_5_a4,
     author = {S. S. Kutateladze},
     title = {Extreme points of subdifferentials},
     journal = {Doklady Akademii Nauk},
     pages = {1001--1003},
     publisher = {mathdoc},
     volume = {242},
     number = {5},
     year = {1978},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1978_242_5_a4/}
}