1. W. V. Ward, M. I. Jacobson andC. O. Matthews,Trans. ASM 54 (1961) 84.
2. M. I. Jacobson, F. M. Almeter andE. C. Burke,ibid 55 (1962) 492.
3. W. Bonfield, J. A. Sartell andC. H. Li,Trans. Met. Soc. AIME 227 (1963) 669.
4. N. A. Hill, “The Metallurgy of Beryllium” (Chapman and Hall, London, 1963) p. 84.
5. P. Bridgman, “Studies in large Plastic Flow and Fracture” (McGraw-Hill, New York, 1952) p. 113.