1. H. Ikeda, H. Komatsu, in: Proceedings of the 34th Japanese Joint Conference on Technology of Plasticity, 1983, p. 93.
2. M. Nakano, et al., J. Jpn. Soc. Technol. Plasticity 13 (1972) 745.
3. H. Kaga, Y. Saotome, et al., J. Jpn. Soc. Technol. Plasticity 29 (1988) 81.