1. C. T. Liu, H. Inouye, and R.W. Carpenter:Met. Trans., 1973, vol. 4, p. 1973.
2. R. W. Carpenter and C. T. Liu:Microstructure and Design of Alloys, Proceedings of 3rd International Conference on Strength of Metals and Alloys, August 1973, vol. l, p. 20.
3. D. E. Etter and W. H. Smith:J. Less-Common Metals, 1972, vol. 27, p. 109.
4. D. R. Schaeffer: “The Effect of Oxygen and Temperature on the Impact Behavior of T-l11 (Ta-8 pct W-2 pct Hf),” MLM-2037, May 1, 1973.
5. L. B. Lundberg and K. A. Johnson:Metallog. Rev., September 1972, vol. 1, p. 32.