1. J. E. Campbell: DMIC Report S-28, June 1969, pp. 8–16.
2. C. J. Barton, B. G. Reisdorf, P. H. Salmon Cox, J. M. Chilton, and C. E. Oskin: AFML-TR-67-34, 1967.
3. G. J. Spaeder:Met. Trans., 1970, vol. 1, pp. 2011–14.
4. G. W. Tuffnell and R. L. Cairns:ASM Trans. Quart., 1968, vol. 61, pp. 798–806.
5. H. J. Rack and David Kalish:Met. Trans., to be published.