1. Fatigue of cold forging dies with various values of hardness;Lee;J. Mater. Process Technol.,2001
2. ASM Handbook, vol. 4, Heat Treating;Bell,1997
3. ASM Metals Handbook, vol. 4, Heat Treating, ninth ed., American Society for Metals, Metals Park, OH, 1991.
4. Practical Nitriding and Ferritic Nitrocarburizing;Pye,2003
5. Effect of ion nitriding on fatigue behaviour of AISI 4140 steel;Genel;Mater. Sci. Eng.,2000