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2. F. E. Low:The Quantum Theory of Scattering.
3. A. Baracca andA. Minguzzi:Nuovo Cimento,39, 687 (1965).
4. National Bureau of Standards,Handbook of Mathematical Functions with Formulas, Graphs and Mathematical Tables (U. S. Government Printing Office, Washington, D. C., third printing 1965), p. 397, 309.
5. National Bureau of Standards,Handbook of Mathematical Functions with Formulas, Graphs and Mathematical Tables (U. S. Government Printing Office, Washington, D. C., third printing 1965), p. 297 (7.1.4).