A~class of functions for which a~given summation method yields the best order approximation.~III
Izvestiâ vysših učebnyh zavedenij. Matematika, no. 6 (1969), pp. 80-87.

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     author = {A. H. Turetzkii},
     title = {A~class of functions for which a~given summation method yields the best order {approximation.~III}},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {80--87},
     publisher = {mathdoc},
     number = {6},
     year = {1969},
     language = {ru},
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}
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A. H. Turetzkii. A~class of functions for which a~given summation method yields the best order approximation.~III. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 6 (1969), pp. 80-87. http://geodesic.mathdoc.fr/item/IVM_1969_6_a10/