1. 1) T. Morikawa, T. Sato, K. Higashida and R. Onodera: Proc. 1st Int. Symp. on Ultrafine Grained Structures, ed. by S. Takaki and T. Maki, (Iron and Steel Inst. of Japan, 2001) pp.160-163.
2. 2) K. Ushioda and W.B. Hutchinson: ISIJ Int. 29 (1989) 862-867.
3. 3) P. Wagner, O. Engler and K. Lücke: Acta Metall. Mater. 43 (1995) 3799-3812.
4. 4) P. Cizek: Mater. Sci. Eng. A324 (2002) 214-218.
5. 5) P. Cizek: Proc. Int. Conf. on Thermomechanical Processing: Mechanics, Microstructure and Control, ed. by E.J. Palmiere, M. Mahfouf and C. Pinna, (The University of Sheffield, 2003) pp.289-295.