1. I. M. Vinogradov, Selected Works [in Russian], Moscow (1952).
2. M. A. Gelbcke, “On the asymptotics of the sum of fractional parts of a function of two variables,” Izv. Akad. Nauk SSSR, Ser. Fiz.-Mat. Nauk, No. 5, 409–423 (1930).
3. E. Landau, Ausgewählte Abhandlungen zur Gitterpunktlehre, Berlin (1962).
4. J. D. Vaaler, “Some extremal problems in Fourier analysis,” Bull. Amer. Math. Soc. (2), 12, 183–216 (1985).
5. M. N. Huxley, Area, Lattice Points, and Exponential Sums, Oxford (1996).