\[W_{\kappa,\mu}\left(x\right)=\sqrt{x}\Gamma\left(\kappa+\tfrac{1}{2}\right)\*%
\left(\sin\left(\kappa\pi-\mu\pi\right)J_{2\mu}\left(2\sqrt{x\kappa}\right)-%
\cos\left(\kappa\pi-\mu\pi\right)Y_{2\mu}\left(2\sqrt{x\kappa}\right)+%
\operatorname{env}\mskip-2.0muY_{2\mu}\left(2\sqrt{x\kappa}\right)O\left(%
\kappa^{-\frac{1}{2}}\right)\right),\]