@article{korobov:1958:ets,
    author = {Korobov, N. M.},
     title = {Estimates of trigonometric sums and their applications},
   journal = {Uspehi Mat. Nauk},
    volume = {13},
      year = {1958},
    number = {4 (82)},
     pages = {185–192},
  language = {Russian},
   mrclass = {10.00},
  mrnumber = {MR0106205 (21 \#4939)},
mrreviewer = {R. A. Rankin},
     zblno = {0086.03803}}