\[W\left(\tfrac{1}{2}\mu^{2},-\mu t\sqrt{2}\right)\sim\frac{2^{\frac{1}{2}}e^{%
\frac{1}{4}\pi\mu^{2}}l(\mu)}{(t^{2}-1)^{\frac{1}{4}}}\left(\sin\sigma\sum_{s=%
0}^{\infty}(-1)^{s}\frac{{\cal{A}}_{2s}(t)}{\mu^{4s}}+\cos\sigma\sum_{s=0}^{%
\infty}(-1)^{s}\frac{{\cal{A}}_{2s+1}(t)}{\mu^{4s+2}}\right),\]