1. G. W. HoffmanPhys. Rev. C
21, 1488 (1980).
2. G. S. Blanpied,Phys. Rev. C
18, 1436 (1978).
3. G. W. Hoffman,Phys. Rev. Lett
40, 1256 (1978).
4. M. S. Hussein, K. W. McVoy,Progress in Particle and Nuclear Physics, forth coming.
5. c.f. M. Born, E. Wolf,Principles of Optics, Pergamon Press, Oxford, England (1975).