1. Z. A. Weinberg, Ph.D. thesis (Princeton University, 1974).
2. D. L. Matthies, Ph.D. thesis (Princeton University, 1973).
3. Z. A. Weinberg, W. C. Johnson, and M. A. Lampert, unpublished.
4. D. L. Matthies, W. C. Johnson, and M. A. Lampert, unpublished.