@article{DAN_1970_190_3_a6,
     author = {A. A. Karatsuba},
     title = {Sums of characters with prime numbers},
     journal = {Doklady Akademii Nauk},
     pages = {517--518},
     publisher = {mathdoc},
     volume = {190},
     number = {3},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1970_190_3_a6/}
}