1. Bourgain J, Watt N. Mean square of zeta function, circle problem and divisor problem revisited. arXiv: 1709.04340v1
2. Fouvry E, Iwaniec H. Exponential sums with monomials. J Number Theory, 1989, 33: 311–333
3. Hampejs M, Holighaus N, Tóth L, Wiesmeyr C. Representing and counting the subgroups of the group ℤm × ℤn. J Numbers, 2014, 2014: 491428
4. Ivić A. The Riemann Zeta-Function: The Theory of the Riemann Zeta-Function with Applications. New York: Wiley, 1985
5. Mertens F. Ueber einige asymptotische Gesetze der Zahlentheorie. J Reine Angew Math, 1874, 77: 289–338