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@article{IVM_1980_12_a5, author = {I. N. Pak}, title = {Monotonicity of sums of some trigonometric series}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {33--37}, publisher = {mathdoc}, number = {12}, year = {1980}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1980_12_a5/} }
I. N. Pak. Monotonicity of sums of some trigonometric series. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 12 (1980), pp. 33-37. http://geodesic.mathdoc.fr/item/IVM_1980_12_a5/