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Is there any standard practice which may represents $J_m(a\pm kx)$ in terms of $J_m(kx)$

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In wikipedia it states (http://en.wikipedia.org/wiki/Bessel_function). \begin{align} I_\nu(z_1+z_2)=\sum_{k=-\infty}^{\infty}I_{\nu-k}(z_1)I_k(z_2) \end{align} However I am not sure where this is referenced from.

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