@article{DAN_1971_200_2_a10,
     author = {G. A. Popov},
     title = {Distribution of the values of an additive function in a progression},
     journal = {Doklady Akademii Nauk},
     pages = {290--293},
     publisher = {mathdoc},
     volume = {200},
     number = {2},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1971_200_2_a10/}
}