Voir la notice de l'article provenant de la source Math-Net.Ru
@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/} }
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/