Xu, Zhe Feng, On the Mean Value of the Complete Trigonometric Sums with Dirichlet Characters, Acta mathematica Sinica. English series (Print) , 23(7), 2007, pp. 1341-1344
The main purpose of this paper is, using the analytic method, to study the mean value properties of the complete trigonometric sums with Dirichlet characters, and give an exact calculating formula for its fourth power mean.