1. W. G. Pfann: Trans. AIME (1952) 194, pp. 747–757; Journal of Metals (July 1952).
2. N. W. Lord: Trans. AIME (1953) 197, p. 1531; Journal of Metals (November 1953).
3. H. Reiss: Trans. AIME (1954) 200, p. 1053; Journal of Metals (September 1954).
4. A. Hayes and J. Chipman: Trans. AIME (1939) 135, p. 85; Metals Technology (December 1938).
5. W. A. Tiller, K. A. Jackson, J. W. Rutter, and B. Chalmers: Acta Metallurgica (1953) 1, No. 4, p. 428.