@article{MZM_1969_6_1_a3,
     author = {N. M. Korobov},
     title = {Double trigonometric sums and their application in approximating rational sums},
     journal = {Matemati\v{c}eskie zametki},
     pages = {25--34},
     publisher = {mathdoc},
     volume = {6},
     number = {1},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1969_6_1_a3/}
}