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@article{IVM_1973_4_a7, author = {N. E. Lushpai}, title = {A~certain optimal quadrature for the class of differentiable periodic functions}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {55--63}, publisher = {mathdoc}, number = {4}, year = {1973}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1973_4_a7/} }
N. E. Lushpai. A~certain optimal quadrature for the class of differentiable periodic functions. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 4 (1973), pp. 55-63. http://geodesic.mathdoc.fr/item/IVM_1973_4_a7/