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@article{TRSPY_1961_62_a0, author = {A. V. Efimov}, title = {Linear methods of approximating certain classes of continuous periodic functions}, journal = {Informatics and Automation}, pages = {3--47}, publisher = {mathdoc}, volume = {62}, year = {1961}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/TRSPY_1961_62_a0/} }
A. V. Efimov. Linear methods of approximating certain classes of continuous periodic functions. Informatics and Automation, Collection of articles on linear methods of summation of Fourier series, Tome 62 (1961), pp. 3-47. http://geodesic.mathdoc.fr/item/TRSPY_1961_62_a0/