1. V. A. Ivchenko, N. N. Syutkin, and A. Yu. Bunkin, J. Phys. (Paris) 49-C6, 379 (1988).
2. V. A. Ivchenko and N. N. Syutkin, Fiz. Met. Metalloved. 61, 575 (1986).
3. V. A. Ivchenko and N. N. Syutkin, Fiz. Tverd. Tela (Leningrad) 25, 3049 (1983) [Sov. Phys. Solid State 25, 1759 (1983)].
4. H. N. Southworth and B. Ralph, Philos. Mag. 21, 23 (1970).
5. V. A. Ivchenko, N. N. Syutkin, and L. Yu. Kuznetsova, in Abstracts of the 34th IFES Conf., Osaka, 1987, Japan, p. 54.