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@article{TM_1971_109_a2, author = {S. B. Stechkin}, title = {The approximation of continuous periodic functions by {Favard} sums}, journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova}, pages = {26--34}, publisher = {mathdoc}, volume = {109}, year = {1971}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/TM_1971_109_a2/} }
S. B. Stechkin. The approximation of continuous periodic functions by Favard sums. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Приближение периодических функций, Tome 109 (1971), pp. 26-34. http://geodesic.mathdoc.fr/item/TM_1971_109_a2/