1. W. G. Burgers and F. M. Jacobs: Metallwirtschaft (1935) 14, p. 285.
2. A. Smigelskas and C. S. Barrett: Trans. AIME (1949) 185, p. 145; Journal of Metals (February 1949).
3. J. McHargue and J. P. Hammond: Trans. AIME (1953) 197, p. 57; Journal of Metals (January 1953).
4. R. K. McGeary and B. Lustman: Trans. AIME (1951) 191, p. 994; Journal of Metals (November 1951).
5. J. H. Keeler, W. R. Hibbard, Jr., and B. F. Decker: Trans. AIME (1953) 197, p. 932; Journal of Metals (July 1953).