%0 Journal Article %A A. F. Lavrik %T An analytic method of estimating trigonometric sums over primes in an arithmetic progression %J Doklady Akademii Nauk %D 1979 %P 1059-1063 %V 248 %N 5 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1979_248_5_a7/ %G ru %F DAN_1979_248_5_a7