@article{DAN_1969_188_3_a4,
     author = {B. V. Levin and A. S. Fainleib},
     title = {Mean values of multiplicative functions},
     journal = {Doklady Akademii Nauk},
     pages = {517--519},
     publisher = {mathdoc},
     volume = {188},
     number = {3},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1969_188_3_a4/}
}