1. H. L. Yu, X. H. Liu, C. Wang, H. D. Park, J. Iron Steel Res. Int. 15 (2008) No. 1, 30–33.
2. R. J. Roark, Formulas for Stress and Strain, McGraw-Hill, New York, 1954.
3. Y. Tozawa, M. Ueda, Journal of the Japan Society for Technology of Plasticity 11 (1970) No. 108, 29–37.
4. H. L. Yu, X. H. Liu, G. T. Lee, Journal of Manufacturing Science and Engineering 130 (2008) No. 1, 0110161–0110167.
5. J. H. Cho, S. M. Hwang, Journal of Manufacturing Science and Engineering –Transactions of the ASME 136 (2014) No. 1, 204–226.