Geodesic
The degree of approximation of functions by the $(C,1)$-means of their orthogonal expansions
Izvestiâ vysših učebnyh zavedenij. Matematika, no. 8 (1967), pp. 3-15 
V. A. Andrienko. The degree of approximation of functions by the $(C,1)$-means of their orthogonal expansions. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 8 (1967), pp. 3-15. http://geodesic.mathdoc.fr/item/IVM_1967_8_a0/
@article{IVM_1967_8_a0,
     author = {V. A. Andrienko},
     title = {The degree of approximation of functions by the $(C,1)$-means of their orthogonal expansions},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {3--15},
     year = {1967},
     number = {8},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1967_8_a0/}
}
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