1. B. J. Allen and J. R. Bird, Phys. Letters
27B:494 (1968).
2. E. Albertson and B. Forkman, Nucl. Phys
70:209 (1965).
3. R. G. Alias, S. S. Hanna, L. Meyer-Schützmeister, and R. E. Segel, Nucl. Phys
58:122(1964).
4. B. J. Allen, Nucl. Phys
A111:1 (1968).
5. B. J. Allen and R. L. Macklin, in: Proceedings of the Third Neutron Cross Section and Technological Conference, Knoxville, Tennessee, 1970, University of Tennessee, Knoxville (1971), p. 764.