1. J. A. Wilson and A. D. Yoffe, Adv. Phys. 18, 193 (1969).
2. M. Inoue, H. P. Hughes, and A. D. Yoffe, Adv. Phys. 38, 565 (1989).
3. M. Inoue and H. Negishi, J. Phys. Soc. Jpn. 54, 380 (1985).
4. V. G. Pleshchev, A. N. Titov, and A. V. Kuranov, Fiz. Tverd. Tela (St. Petersburg) 39(9), 1618 (1997) [Phys. Solid State 39 (9), 1442 (1997)].
5. A. V. Kuranov, V. G. Pleshchev, A. N. Titov, N. V. Baranov, and L. S. Krasavin, Fiz. Tverd. Tela (St. Petersburg) 42(11), 2029 (2000) [Phys. Solid State 42 (11), 2089 (2000)].