where is the Hankel Function of the Second Kind and and are the Spherical Bessel Functions of the First and Second Kinds. Explicitly, the first is

**References**

Abramowitz, M. and Stegun, C. A. (Eds.). ``Spherical Bessel Functions.'' §10.1 in
*Handbook of Mathematical Functions with Formulas, Graphs, and Mathematical Tables, 9th printing.*
New York: Dover, pp. 437-442, 1972.

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1999-05-26