\[M\left(a,b,x\right)=\Gamma\left(b\right)e^{\frac{1}{2}x}\left((\tfrac{1}{2}b-a%
)x\right)^{\frac{1}{2}-\frac{1}{2}b}\*\left(J_{b-1}\left(\sqrt{2x(b-2a)}\right%
)+\operatorname{env}\mskip-2.0muJ_{b-1}\left(\sqrt{2x(b-2a)}\right)O\left({%
\left|a\right|}^{-\frac{1}{2}}\right)\right),\]