1. B. Fogg, Sheet Metal Ind. 44, 95–112 (1967)
2. R. Blbach, Ann. CIRP 36, 181–184 (1987)
3. W.C. Emmence, in Proceedings of 15th IDDRG Congress (1988), pp. 63–70
4. K.J. Weinmann, S.R. Bhonsle, J. Gerstenberger, Ann. CIRP 39, 263–266 (1990)
5. W.R.D. Wilson, H.G. Malkani, P.K. Saha, Proc. NAMRI/SME XIX, 37–42 (1991)