1. S. T. Wlodek:Trans. Am. Soc. Met., 1964, vol. 57, pp. 110–19.
2. E. W. Ross:Journal of Metals, 1967, vol. 19, No. 12, pp. 12–14.
3. C. T. Sims:Journal of Metals, 1966, vol. 18, No. 10, pp. 1119–30.
4. S. T. Wlodek:Trans. Am. Soc. Met., 1963, vol. 56, pp. 287–303.
5. D. K. Das, S. P. Rideout, and P. A. Beck:Trans. AIME, 1952, vol. 194, pp. 1071–79.