@article{DAN_1957_114_6_a8,
     author = {S. L. Sobolev},
     title = {The extensions of abstract function spaces connected with the theory of the integral},
     journal = {Doklady Akademii Nauk},
     pages = {1170--1173},
     publisher = {mathdoc},
     volume = {114},
     number = {6},
     year = {1957},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1957_114_6_a8/}
}