@article{DAN_1979_248_5_a7,
     author = {A. F. Lavrik},
     title = {An analytic method of estimating trigonometric sums over primes in an arithmetic progression},
     journal = {Doklady Akademii Nauk},
     pages = {1059--1063},
     publisher = {mathdoc},
     volume = {248},
     number = {5},
     year = {1979},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1979_248_5_a7/}
}