@article{DAN_1957_115_1_a13,
     author = {S. L. Sobolev},
     title = {Imbedding theorems for abstract functions of sets},
     journal = {Doklady Akademii Nauk},
     pages = {57--59},
     year = {1957},
     volume = {115},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1957_115_1_a13/}
}