\[E_{p,q}(z)=(2\pi)^{\ifrac{(p-q)}{2}}\kappa^{-\nu-(\ifrac{1}{2})}{\mathrm{e}}^{%
\kappa z^{\ifrac{1}{\kappa}}}\sum_{k=0}^{\infty}c_{k}\left(\kappa z^{\ifrac{1}%
{\kappa}}\right)^{\nu-k},\]