1. The material in this section is treated in several texts, e.g. “Collision Theory” by Goldberger and Watson, John Wiley & Sons, Inc., New York.
2. K. M. Watson, Phys. Rev. 105, 1388 (1957); M. M. Sternheim, Phys. Rev. B135, 912 (1964).
3. H. Garcilazo and W. R. Gibbs, Los Alamos Preprint LA-UR-78-897; G. A. Miller, Phys. Rev. C14, 361 (1976).
4. A. Kerman, II. McManus and R. Thaler, Ann. of Phys. 8, 551 (1959).
5. L. S. Kisslinger, Phys. Rev. 98, 761 (1955).