1. S. E. Rogers and A. Thomas. Drop forging— past achievements and future prospects, Metallurgia and Metal Forming (1973) 40, 236.
2. F. Bakhtar. The economics of high-energy rate forming. The Engineer (1969) 7 March.
3. S. M. J. Ali. Die wear in high-speed hot forging. Ph.D. Thesis University of Birmingham.
4. A Thomas. Investigation on die materials. Ph.D. Thesis Sheffield Polytechnic (1970).
5. J. L. Aston and A. R. Muir. Factors affecting the life of drop forging dies. J.I.S.I. (1969) 207, 167.