1. R. L. Chapman, D. E. Harms, and G. P. Sorenson, Proc. Sixth Hypervelocity Impact Symposium, 1963, Vol. 1, p. 319 (unpublished).
2. D. E. Brast and D. R. Sawle, Proc. Seventh Hypervelocity Impact Symposium, 1964, Vol. 1, p. 187 (unpublished).
3. J. P. Barber, Ph.D. dissertation (The Australian National University, 1972 (unpublished).