Geodesic
Exact constants in Jackson inequalities for best spherical mean square approximations
Izvestiâ vysših učebnyh zavedenij. Matematika, no. 12 (1981), pp. 67-78.

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@article{IVM_1981_12_a9,
     author = {V. Yu. Popov},
     title = {Exact constants in {Jackson} inequalities for best spherical mean square approximations},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {67--78},
     publisher = {mathdoc},
     number = {12},
     year = {1981},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1981_12_a9/}
}
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V. Yu. Popov. Exact constants in Jackson inequalities for best spherical mean square approximations. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 12 (1981), pp. 67-78. http://geodesic.mathdoc.fr/item/IVM_1981_12_a9/