@article{MZM_1970_8_5_a11,
     author = {N. M. Korobov},
     title = {Trigonometric sums with exponential functions and the distribution of signs in repeating decimals},
     journal = {Matemati\v{c}eskie zametki},
     pages = {641--652},
     publisher = {mathdoc},
     volume = {8},
     number = {5},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1970_8_5_a11/}
}