(1) |

(2) |

(3) |

**References**

Abramowitz, M. and Stegun, C. A. (Eds.).
*Handbook of Mathematical Functions with Formulas, Graphs, and Mathematical Tables, 9th printing.*
New York: Dover, p. 504, 1972.

Arfken, G. ``Confluent Hypergeometric Functions.'' §13.6 in
*Mathematical Methods for Physicists, 3rd ed.* Orlando, FL: Academic Press, pp. 753-758, 1985.

Morse, P. M. and Feshbach, H. *Methods of Theoretical Physics, Part I.* New York: McGraw-Hill, pp. 551-555, 1953.

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1999-05-26