@article{DAN_1957_116_4_a1,
     author = {Ya. S. Bugrov},
     title = {On imbedding theorems},
     journal = {Doklady Akademii Nauk},
     pages = {531--534},
     publisher = {mathdoc},
     volume = {116},
     number = {4},
     year = {1957},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1957_116_4_a1/}
}