1. S. Lee, P.R Berbon, M. Furukawa, Z. Horita, M. Nemoto, N.K. Tsenev, R.Z. Valiev, T.G. Langdon,. Mater. Sci. Eng.A272, 1999, p.63
2. A.J. Barnes. Mater. Sci. Forum, 170–172, 1994, p. 701.
3. K. Osada and H. Yoshida. Mater. Sci. Forum, 170–172, 1994, p.715.
4. T.G. Langdon Acta. Mater. 42,1994 ,p.2437
5. P.B. Prangnell , J.R. Bowen, A. Gholinia, Proceedings of the 22nd Riso International Symposium on Materials Science, Science of Metastable and nanocrystalline Alloys Structure, Properties and Modeling, Riso National Laboratory, Roskilde, Denmark, 2001, p.105.