@article{DAN_1991_319_3_a6,
     author = {A. A. Karatsuba},
     title = {Distribution of values of {Dirichlet} characters on additive},
     journal = {Doklady Akademii Nauk},
     pages = {543--545},
     publisher = {mathdoc},
     volume = {319},
     number = {3},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1991_319_3_a6/}
}