Geodesic
Approximation of periodic functions by partial sums of Fourier series, for classes that are defined by a~polyharmonic operator
Izvestiâ vysših učebnyh zavedenij. Matematika, no. 3 (1973), pp. 56-67.

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     author = {L. N. Labunets},
     title = {Approximation of periodic functions by partial sums of {Fourier} series, for classes that are defined by a~polyharmonic operator},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {56--67},
     publisher = {mathdoc},
     number = {3},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1973_3_a8/}
}
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L. N. Labunets. Approximation of periodic functions by partial sums of Fourier series, for classes that are defined by a~polyharmonic operator. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 3 (1973), pp. 56-67. http://geodesic.mathdoc.fr/item/IVM_1973_3_a8/