1. Factors affecting the life of drop forging dies;Aston;J. Iron Steel Inst., London,1969
2. A statistical study of drop forgings;Lindner;Werkstattstechnik,1963
3. Wear of drop forging dies;Thomas,1970
4. Wear Tests on Die Materials;Thomas,1965
5. Friction and wear during the hot forging of steels;Felder;Tribol. Int.,1980