1. Abramowitz M and Stegun I A (eds) 1970Handbook of mathematical functions (New York: Dover) pp. 505, 538
2. Dalitz R H 1951Proc. R. Soc. (London) A206 509
3. Gradshteyn I S and Ryzhik I M 1973Table of integrals, series and products (New York: Academic Press) pp. 286, 334
4. Merzbacher E 1962Quantum mechanics (New York: John Wiley) Chap. 12, pp. 242–247
5. Schiff L I 1968Quantum mechanics (Kogakusha, Tokyo: McGraw Hill) Chap. 5, pp. 138–144