@article{TM_1971_112_a22,
     author = {S. A. Stepanov},
     title = {The estimation of rational trigonometric sums with prime denominator},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {346--371},
     publisher = {mathdoc},
     volume = {112},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_1971_112_a22/}
}