\[I_{\nu}'\left(z\right)K_{\nu}'\left(z\right)\sim-\frac{1}{2z}\left(1+\frac{1}{%
2}\frac{\mu-3}{(2z)^{2}}-\frac{1}{2\cdot 4}\frac{(\mu-1)(\mu-45)}{(2z)^{4}}+%
\dotsb\right),\]