@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/}
}