1. H. Xiang, X.C. Zhuang and Z. Zhao: Applied Mechanics and Materials, Vol. 16-19 (2009), pp.105-108.
2. J.L. Wang, Y.P. Wei and X.Y. Ruan: Journal of Plasticity Engineering (China), Vol. 8 (2001), pp.56-58.
3. S.X. Yuan and B. Li: Applied Mechanics and Materials, Vol. 16-19 (2009), p.60.
4. W. H Kuang: Applied Mechanics and Materials, Vol. 16-19 (2009), pp.628-632.
5. X.F. Wang and L.H. Lang: CAE Design and Application in Sheet Forming Based on DYNAFORM (BeiHang University Publications, China 2008).