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@article{TM_1984_166_a13, author = {S. M. Nikol'skii and P. I. Lizorkin}, title = {Approximation by spherical polynomials}, journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova}, pages = {186--200}, publisher = {mathdoc}, volume = {166}, year = {1984}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/TM_1984_166_a13/} }
S. M. Nikol'skii; P. I. Lizorkin. Approximation by spherical polynomials. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Modern problems of mathematics. Differential equations, mathematical analysis and their applications, Tome 166 (1984), pp. 186-200. http://geodesic.mathdoc.fr/item/TM_1984_166_a13/