@article{MZM_1993_53_1_a5,
     author = {M. V. Kudryavtsev},
     title = {Estimation of a~complete rational trigonometric {sum.~I}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {59--67},
     publisher = {mathdoc},
     volume = {53},
     number = {1},
     year = {1993},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1993_53_1_a5/}
}