Modified Bessel functions
\[
e^{x \left( z - 1/z \right) /2} = \sum_{n=-\infty}^{\infty} z^n J_n (x)
\]
- Bowman, Frank Introduction to Bessel Functions (Dover: New York, 1958). ISBN 0-486-60462-4.
- Dutka, J., On the early history of Bessel functions, Archive for History of Exact Sciences, volume 49, pages 105–134 (1995). https://doi.org/10.1007/BF00376544
- Watson, G.N., A Treatise on the Theory of Bessel Functions,
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