Linear summability methods for orthogonal series in $L^2_{[0,1]}$
Izvestiâ vysših učebnyh zavedenij. Matematika, no. 5 (1975), pp. 52-66.

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@article{IVM_1975_5_a8,
     author = {P. M. Sakhnenko},
     title = {Linear summability methods for orthogonal series in $L^2_{[0,1]}$},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {52--66},
     publisher = {mathdoc},
     number = {5},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1975_5_a8/}
}
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P. M. Sakhnenko. Linear summability methods for orthogonal series in $L^2_{[0,1]}$. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 5 (1975), pp. 52-66. http://geodesic.mathdoc.fr/item/IVM_1975_5_a8/