Cramer proved the following theorem:

Consider the following function:

>$$V(z)=\sum_k e^{\rho_kz}$$

Where $\rho_k$ runs through non trivial zeta zeros with $Im(\rho_k) > 0$ 

Cramer proved $V(z)$ converges for $Im(z) > 0$ and has a singularity at the origin of the type $\frac{\log(z)}{(1-e^{-z})}$
by which it means that the function 


>$$F(z) = 2πiV(z) -\frac{\log(z)}{(1-e^{-z})}$$



has a meromorphic continuation to all C, with simple poles at the points $+/- πin$ where 
n ranges over the integers, and at the points $+/-\log(p^m)$ where $p^m$ ranges over the 
prime powers. 

I have following questions

>(1) I'm wondering if $V(z)$ has alternate explicit expression ?

>(2) (Simpler) reference where I can study about this ? ( Other than Cramers paper itself)