1. L. I. Schiff:Phys. Rev.,103, 443 (1956).
2. D. S. Saxon:Formulation of High Energy Potential Scattering Problems (submitted for publication to thePhys. Rev.).
3. The analysis of the remainder of this section is a slight extension of that of’E. Feenberg:Plys. Rev.,40, 40 (1932), andL. I. Schiff:Progr. Theor. Phys. (Kyoto),.11, 288 (1954).
4. R. Glauber andV. Schomaker:Phys. Rev.,89, 667 (1953).