Approximation by spherical functions
Informatics and Automation, Investigations in the theory of differentiable functions of many variables and its applications. Part 11, Tome 173 (1986), pp. 181-189.

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@article{TRSPY_1986_173_a14,
     author = {P. I. Lizorkin and S. M. Nikol'skii},
     title = {Approximation by spherical functions},
     journal = {Informatics and Automation},
     pages = {181--189},
     publisher = {mathdoc},
     volume = {173},
     year = {1986},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_1986_173_a14/}
}
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P. I. Lizorkin; S. M. Nikol'skii. Approximation by spherical functions. Informatics and Automation, Investigations in the theory of differentiable functions of many variables and its applications. Part 11, Tome 173 (1986), pp. 181-189. http://geodesic.mathdoc.fr/item/TRSPY_1986_173_a14/