1. Yamashita, Y., Yokoyama, K., Honda, H. and Takahashi, T. (1981), Jap. J. Appl. Phys. 20, 183.
2. Ito, Y., Nagatsuma, K., Takeuchi, H. and Jyomura, S. (1981), J. Appl. Phys. 52 (7), 44–79.
3. de Frutos, J., Lopez, F. and Jimenez, B. (1992), Proc. ISAF’
92. p. 36.
4. Millar, C.E., Wolny, W.W., Pardo, L., Ricote, J., Sirera, R., Feuillard, G. and Lethiecq, M. (1993), Proc. of the Third Meeting of the ECS. vol. 2, pp. 187.
5. Adachi, H., Kawaguchi, T., Kitanabe, M. and Wasa, K. (1983), Jap. J. Appl. Phys. 22, Suppl. 22–2, 11.