@article{DAN_1987_294_5_a5,
     author = {G. A. Kalyabin},
     title = {On the moduli of smoothness of functions given on a sphere},
     journal = {Doklady Akademii Nauk},
     pages = {1051--1054},
     publisher = {mathdoc},
     volume = {294},
     number = {5},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1987_294_5_a5/}
}