1. G. A. Roberts, J.C. Hamaker, and A.R. Johnson:Tool Steels, 4th ed., ASM, Metals Park, OH, 1962, pp. 563–67.
2. S. Malm and L.A. Norstrom:Metals Science, 1979, vol. 13, pp. 544–50.
3. G. A. Roberts, J.C. Hamaker, and A.R. Johnson:Tool Steels, 4th ed., ASM, Metals Park, OH, 1962, p. 613.
4. R.W. K.Honeycombe:Structure and Strength of Alloy Steels, Climax Molybdenum Co., Ltd., London, England, p. pp16.
5. M.S. Bhat, W.M. Grrison Jr., and V.F. Zackay:Materials Science and Engineering, 1979, vol. 41, pp. 1–15.