Geodesic
Best mean approximation of a~cosine series with convex coefficients
Izvestiâ vysših učebnyh zavedenij. Matematika, no. 8 (1978), pp. 50-55.

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@article{IVM_1978_8_a6,
     author = {V. \`E. Gheit},
     title = {Best mean approximation of a~cosine series with convex coefficients},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {50--55},
     publisher = {mathdoc},
     number = {8},
     year = {1978},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1978_8_a6/}
}
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EP  - 55
IS  - 8
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V. È. Gheit. Best mean approximation of a~cosine series with convex coefficients. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 8 (1978), pp. 50-55. http://geodesic.mathdoc.fr/item/IVM_1978_8_a6/