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@article{DAN_1988_301_4_a4, author = {V. Yu. Popov}, title = {Approximations on a sphere in $L_2$}, journal = {Doklady Akademii Nauk}, pages = {793--797}, publisher = {mathdoc}, volume = {301}, number = {4}, year = {1988}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1988_301_4_a4/} }
V. Yu. Popov. Approximations on a sphere in $L_2$. Doklady Akademii Nauk, Tome 301 (1988) no. 4, pp. 793-797. http://geodesic.mathdoc.fr/item/DAN_1988_301_4_a4/