1. Tom, M. A.: Introduction to Analytic Number Theory, Springer-Verlag, New York, 1976
2. Pan, C. D., Pan, C. B.: Element of the Analytic Number Theory, Science Press, Beijing, 1991 (in Chinese)
3. Ireland, K., Rosen, M.: A Classical Introduction to Modern Number Theory, Springer-Verlag, New York, 1982
4. Zhang, W. P.: On the 2k-th power mean of inversion of Dirichlet L-function. Chinese Annals of Mathematics, 14A(1), 1–5 (1993) (in Chinese)
5. Vaughan, R. C.: An elementary method in prime number theory, Recent Progress in Analytic Number Theory, Academic Press, 1, 341–347 (1981)