@article{MZM_1974_15_5_a18,
     author = {A. I. Stepanets},
     title = {Approximation of continuous periodic functions of many variables by spherical {Riesz} means},
     journal = {Matemati\v{c}eskie zametki},
     pages = {821--832},
     publisher = {mathdoc},
     volume = {15},
     number = {5},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1974_15_5_a18/}
}