1. J. Kudo (1960), Some analytical and experimental studies of axi-symmetric cold forging and extrusion — I. Int. J. Mech. Sci. 2, p. 102-
2. R.P. McDermott, A.N. Bramley (1975), An elementhal upper-bound technique for general use in forging analysis, Proc. 15th. Int. Machine Tool and Design Research Conf., p. 437.
3. R.P. McDermott, A.N. Bramley (1974), Forging analysis — a new approach, Proc. Second North American Metalworking Research Conf. p. 35-.
4. R.P. McDermott, A.N. Bramley, A.S. Cramphorn (1976), UBET Related Developments in forging analysis, Proc. Fourth North American Metalworking Research Conf. p. 80-.
5. A.S. Cramphorn, A.N. Bramley (1977), Computer aided forging design with UBET, Proc. 18th Int. Machine Tool Design and Research Conf. p. 717.