@article{DAN_1973_212_2_a8,
     author = {A. M. Sedletskii},
     title = {Mean periodic extension of continuous functions with preservation of smoothness},
     journal = {Doklady Akademii Nauk},
     pages = {302--304},
     publisher = {mathdoc},
     volume = {212},
     number = {2},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1973_212_2_a8/}
}