Geodesic
Approximation of periodic functions by linear operators
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Theory of functions and related questions of analysis, Tome 180 (1987), pp. 98-99.

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     author = {A. N. Davidchik and A. A. Ligun},
     title = {Approximation of periodic functions by linear operators},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {98--99},
     publisher = {mathdoc},
     volume = {180},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_1987_180_a53/}
}
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A. N. Davidchik; A. A. Ligun. Approximation of periodic functions by linear operators. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Theory of functions and related questions of analysis, Tome 180 (1987), pp. 98-99. http://geodesic.mathdoc.fr/item/TM_1987_180_a53/