@article{DAN_1984_278_3_a7,
     author = {I. V. Petrova},
     title = {Jackson's theorem and {Besov} spaces on a sphere},
     journal = {Doklady Akademii Nauk},
     pages = {544--549},
     publisher = {mathdoc},
     volume = {278},
     number = {3},
     year = {1984},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1984_278_3_a7/}
}