1. G. T. Brown and B. A. James:Low-Alloy Steels, p. 9, The Iron and Steel Institute, London, 1968.
2. J. M. Hodge:Metals Handbook, p. 494, 1948 Edition, ASM, Metals Park, Ohio.
3. M. A. Grossmann:Trans. TMS-AIME, 1942, vol. 150, p. 227.
4. W. Crafts and J. L. Lamont:Trans. TMS-AIME, 1944, vol. 158, p. 157.
5. I. R. Kramer, S. Siegel, and J. G. Brooks:Trans. TMS-AIME, 1946, vol. 167, p. 670.