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@article{TRSPY_1987_180_a53, author = {A. N. Davidchik and A. A. Ligun}, title = {Approximation of periodic functions by linear operators}, journal = {Informatics and Automation}, pages = {98--99}, publisher = {mathdoc}, volume = {180}, year = {1987}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/TRSPY_1987_180_a53/} }
A. N. Davidchik; A. A. Ligun. Approximation of periodic functions by linear operators. Informatics and Automation, Theory of functions and related questions of analysis, Tome 180 (1987), pp. 98-99. http://geodesic.mathdoc.fr/item/TRSPY_1987_180_a53/