@article{MZM_1974_15_1_a3,
     author = {B. I. Golubov},
     title = {The approximation of {a~H\"older} class of two variables by {Riesz} spherical means},
     journal = {Matemati\v{c}eskie zametki},
     pages = {33--43},
     publisher = {mathdoc},
     volume = {15},
     number = {1},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1974_15_1_a3/}
}