1. Leduc L.: Ph. D. Thesis, University of Sheffield, 1980.
2. Sah J. P., Richardson G. J., Sellars C. M.: J. Aust. Inst. Met.14 (1969) 292.
3. Sellars C. M.: Metalurgia i Odlevnictvo3 (1979) 376.
4. Roberts W., Boden H., Ahlblom B.: Met. Sci.13 (1979) 195.
5. Sellars C. M.:in Hot Working and Forming Processes, (eds. C. M. Sellars, G. J. Davies, Metals Soc., London, 1980, p. 3.