1. ASM Handbook, 1981, Vol. 4, pp. 32–35.
2. M.A. Grossman and M. Asimari:Hardenability of Alloy Steels, pp. 124–190, American Society for Metals, Metals Park, Ohio.
3. R.W. Monroe and C.E. Bates:J. Heat Treating, 1983, Vol. 3, p. 83.
4. R.W. Heins and E.R. Mueller:Metal Progress, 1982, September.
5. T.L. Proft:Industrial Heating, 1986, December, pp. 14–16.