1. D. Webster:ASM Trans. Quart., 1968, vol. 61, p. 816.
2. D. Webster:ASM Trans. Quart., 1969, vol. 62, p. 759.
3. D. Webster:Met. Trans., 1971, vol. 2, pp. 1857–62.
4. D. Webster:J. Iron Steel Inst., July 1962, vol. 200, p. 520.
5. D. Webster: Boeing Document D6-25220, April 1970. Available from DDC.