\[e^{\frac{1}{2}y}\left(\frac{x+y}{x}\right)^{\mu+\frac{1}{2}}\sum_{n=0}^{\infty%
}\frac{1}{n!}\left(\frac{-y}{\sqrt{x}}\right)^{n}\*W_{\kappa+\frac{1}{2}n,\mu+%
\frac{1}{2}n}\left(x\right),\]