1. H. W. Worner: Journal Inst. Metals (1951–1952) 80, pp. 213–216.
2. H. K. Adenstedt, J. R. Pequignot, and J. M. Raymer: Trans. ASM (1952) 44, pp. 990–1003.
3. D. J. Delazaro, M. Hansen, R. E. Riley, and W. Rostoker: Trans. AIME (1952) 194, pp. 265–269; Journal of Metals (March 1952).
4. C. W. Phillips and D. N. Frey: Trans. AIME (1952) 194, pp. 381–386; Journal of Metals (April 1952).
5. L. S. Busch: Journal of Metals (February 1953) 5, pp. 146–149.