a Khabarovsk Division of the Institute of Applied Mathematics, Far Eastern Branch, Russian Academy of Sciences, Khabarovsk, 680000 Russia
b Pacific National University, Khabarovsk, 680035 Russia
Correspondence to: *e-mail: vab@iam.khv.ru
Correspondence to: **e-mail: ustinov.alexey@gmail.com
Received 28 May, 2020
Keywords: analytic number theory, Kloosterman sums, estimates of trigonometric sums
DOI: 10.1134/S1064562420050294