On the question of the approximation of functions by de la Vall\'ee-Poussin means
Izvestiâ vysših učebnyh zavedenij. Matematika, no. 5 (1969), pp. 85-98.

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     author = {Yu. M. Shmandin},
     title = {On the question of the approximation of functions by de la {Vall\'ee-Poussin} means},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {85--98},
     publisher = {mathdoc},
     number = {5},
     year = {1969},
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Yu. M. Shmandin. On the question of the approximation of functions by de la Vall\'ee-Poussin means. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 5 (1969), pp. 85-98. http://geodesic.mathdoc.fr/item/IVM_1969_5_a11/