\[W\left(0,\pm x\right)=2^{-\frac{5}{4}}\sqrt{\pi x}\left(J_{-\frac{1}{4}}\left(%
\tfrac{1}{4}x^{2}\right)\mp J_{\frac{1}{4}}\left(\tfrac{1}{4}x^{2}\right)%
\right),\]