1. Standifer, L. R., Z. Metallkunde, 58, 512 (1967).
2. Cowan, G. R., and Holtzmann, A. H., Welding Res. Counc. Bull., No. 104, 1 (1965).
3. Wright, E. S., and Bayce, A. E., NATO Conf. on High Energy Rate Working of Metals, Sandefjord Lillehammer, 1, 448 (September 1964).