@article{DAN_1962_144_5_a8,
     author = {S. S. Litvinkov},
     title = {Differentiability of {Fourier} series with respect to generalized spherical functions},
     journal = {Doklady Akademii Nauk},
     pages = {977--980},
     publisher = {mathdoc},
     volume = {144},
     number = {5},
     year = {1962},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1962_144_5_a8/}
}