   </p>
<div class="blockquote"><blockquote class="blockquote"><p>
        <span class="serif_italic"><span class="emphasis"><em>W(z) = 1/2Π ∫<sub>-Π</sub><sup>Π</sup>  ((1-
        v cot(v) )^2 + v^2)/(z + v csc(v) exp(-v cot(v))) dv</em></span></span>
      </p></blockquote></div>
<p>
      so it can be effectively computed via Gaussian quadrature using the following
      code:
    </p>
<pre class="programlisting"><span class="identifier">Complex</span> <span class="identifier">z</span><span class="