On the distribution of a-values of Selberg zeta-function assoc. to finite volume Riemann surfaces

On the distribution of a-values of Selberg zeta-function assoc. to finite volume Riemann surfaces - W. Luo has investigated the distribution of zeros of the derivative of the Selberg zeta function associated to compact hyperbolic Riemann surfaces. In essence, the main results in Luo's article involve the following three points: Finiteness for the number of zeros in the half plane to the left of the critical line; an asymptotic expansion for the counting function measuring the vertical distributi