T.M. Apostol, Introduction to Analytic Number Theory, Springer, New York, Heidelberg, Berlin, 1955.
B. Bagchi, The Statistical Behaviour and Universality Properties of the Riemann Zeta-Function and Other Allied Dirichlet Series, PhD dissertation, Indian Statistical Institute, Calcutta, India, 1981.
R. Balasubramanian, A note on Hurwitz’s zeta-function, Ann. Acad. Sci. Fenn., Ser. A I, Math., 4:41–44, 1979.
K.A. Broughan, Vanishing of the integral of the Hurwitz zeta function, Bull. Aust. Math. Soc., 65:121–127, 2002.
K.M. Eminyan, χ-universality of the Dirichlet L-function, Mat. Zametki, 47(6):132–137, 1990 (in Russian).
R. Garunkštis, Approximation of the Lerch zeta-function, Lith. Math. J., 44(2):140–144, 2004.
G.H. Hardy and J.E. Littlewood, Contributions to the theory of the Riemann zeta-function and the theory of the distribution of primes, Acta Math., 41:119–196, 1917.
G.H. Hardy and J.E. Littlewood, The approximate functional equation in the theory of the zeta-function, with applications to the divisor problems of Dirichlet and Piltz, Proc. Lond. Math. Soc. (2), 21:39–74, 1923.
D.R. Heath-Brown, The fourth power mean of Dirichlet’s L-functions, Analysis, 1:25–32, 1981.
A.E. Ingham, Mean-value theorems in the theory of the Riemann zeta-function, Proc. Lond. Math. Soc. (2), 27:273–300, 1927.
A. Kačėnas and A. Laurinčikas, On the periodic zeta-function, Lith. Math. J., 41(2):168–177, 2001.
M. Katsurada and K. Matsumoto, Discrete mean values of Hurwitz zeta-functions, Proc. Japan Acad., Ser. A, 69: 164–169, 1993.
E. Landau, Über das Nichtverschwinden der Dirichletschen Reihen, welche komplexen Charakteren entsprechen, Math. Ann., 70:69–78, 1911.
A. Laurinˇcikas and R. Garunkštis, The Lerch Zeta-Function, Kluwer, Dordrecht, 2002.
J.E. Littlewood, On the class-number of the corpus P(−k), Proc. Lond. Math. Soc. (2), 27:358–372, 1928.
K. Matsumoto, Recent developments in the mean square theory of the Riemann zeta and other zeta-functions, in R.P. Bambah, V.C. Dumir, and R.J. Hans-Gill (Eds.), Number Theory, Trends Math., Birkhäuser, Basel, 2000, pp. 241–286.
N. Oswald and J. Steuding, Aspects of zeta-function theory in the mathematicalworks of Adolf Hurwitz, in J. Sander, J. Steuding, and R. Steuding (Eds.), From Arithmetic to Zeta-Functions. Number Theory in Memory of Wolfgang Schwarz, Springer, Cham, 2016, pp. 309–351.
R.E.A.C. Paley, On the k-analogues of some theorems in the theory of the Riemann ζ-function, Proc. Lond. Math. Soc. (2), 32:273–311, 1931.
K. Soundararajan, The fourth moment of Dirichlet L-functions, inW. Duke and Y. Tschinkel (Eds.), Analytic Number Theory. A Tribute to Gauss and Dirichlet, Clay Math. Proc., Vol. 7, AMS, Providence, RI, 2007, pp. 239–246.
E.C. Titchmarsh, The Theory of the Riemann Zeta-Function, 2nd ed., Oxford Univ. Press, Oxford, 1986.
Z. Wenpeng, On the mean square value of Dirichlet’s L-functions, Compos. Math., 84:59–69, 1992.