2 citations to https://www.mathnet.ru/eng/dan43677
  1. V. N. Chubarikov, “Mnogomernye problemy teorii prostykh chisel”, Chebyshevskii sb., 12:4 (2011), 174–263  mathnet  mathscinet
  2. N. N. Rogovskaya, V. Z. Sokolinskii, “On estimates of multiple trigonometric sums”, Russian Math. Surveys, 40:5 (1985), 237–238  mathnet  crossref  mathscinet  zmath