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