On a divisor problem related to the Epstein zeta-function, IV
We consider to be the -function attached to a particular automorphic form on . We establish an upper bound for the mean square estimate on the critical line of Rankin-Selberg -function . As an application of this result, we give an asymptotic formula for the discrete sum of coefficients of .
In the paper the asymptotics for Dirichlet polynomials associated to certain cusp forms are obtained.
A formula for the mean value of multiplicative functions associated to certain cusp forms is obtained. The paper is a continuation of [4].