1. D. Goldfeld, Automorphic Forms and $$L$$-functions for the Group $$GL(n,\mathbb{R})$$, with an Appendix by Kevin A. Broughan, Cambridge Stud. Adv. Math., vol. 99, Cambridge University Press (Cambridge, 2006).
2. J. Huang, D. Y. Zhang and H. F. Liu, Power moments of automorphic $$L$$-functions related to Maass forms for $$SL_3(\mathbb{Z})$$, Open Math., 19 (2021), 1007-1017.
3. A. Ivić, On zeta-functions associated with Fourier coefficients of cusp forms, in: Proc. Amalfi Conf. Analytic Number Theory, E. Bombieri et al., eds, Universitá di Salerno (1992), pp. 231-246.
4. A. Ivić, The Riemann Zeta Function: The Theory of the Riemann Zeta Function with Applications, Wiley (New York, 1985).
5. H. Jacquet and J. A. Shalika, On Euler products and the classification of automorphic representations. I, Amer. J. Math., 103 (1981), 499-558.