@article{MZM_1994_55_2_a12,
     author = {S. B. Stechkin},
     title = {Some extremal properties of trigonometric sums},
     journal = {Matemati\v{c}eskie zametki},
     pages = {130--143},
     publisher = {mathdoc},
     volume = {55},
     number = {2},
     year = {1994},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1994_55_2_a12/}
}