1. R. L. Whiteley, Trans. ASM 52 (1960) 154.
2. M. Fukuda, J. Jpn Soc. Tech. Plast. 5 (36) (1964) 3.
3. Y. Yamada, ibid., 5 (38) (1964) 183.
4. G. G. Moore and J. F. Wallace, J. Inst. Metals 93 (1964–1965) 33.
5. D. C. Chiang and Shiro Kobayashi, J. Eng. Ind. November (1966) 443.