@article{DAN_1973_209_3_a12,
     author = {N. A. Strelkov},
     title = {On approximations of certain function spaces and their applications},
     journal = {Doklady Akademii Nauk},
     pages = {565--568},
     publisher = {mathdoc},
     volume = {209},
     number = {3},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1973_209_3_a12/}
}