1. B. A. Wilcox, G. T. Han, and R. I. Jaffee: AFML-TR-72-238, December 1972.
2. P. A. Russo, S. R. Seagle, and H. B. Bomberger: AFML-TR-70-125, July 1970.
3. T. K. Redden and C. E. Shamblen: AFML-TR-70-168, June 1970.
4. H. W. Rosenberg:Proceedings of the Second International Ti Conference, Cambridge, Mass., May, 1972.
5. L. J. Cuddy and J. C. Raley:Acta Met., 1973, vol. 21, p. 427.