1. M. Tatsumi, T. Kawase, T. Araki, N. Yamabyashi, T. Iwase, Y. Miura, M. Murai, K. Tada and S. Akai,Proc. First Intl. Conf. on InP and Related Materials for Adv. Electronic and Optical Devices, Oklahoma, SPIE 1144, 18 (1989).
2. Y. Hosokawa, S. Kawarabayashi, Y. Yabuhara, M. Morioka, M. Yokogawa and S. Akai,Proc. Fourth Intl. Conf. on InP and Related Material, Newport, (1992), p. 258.
3. Y. Yabuhara, S. Kawarabayashi, N. Toyoda, M. Yokogawa, K. Fujita and M . Yamada,Fifth Intl. Conf. on InP and Related Material, Paris, (1993), p. 309.
4. K. Kohiro, K. Kainosho, H. Shimakura, T. Fukui and O. Oda,Proc. Second lntl. Conf. on InP and Related Materials for Adv. Electronic and Optical Devices, Denver, (1990), p. 35.
5. K. Kohiro, K. Kainosho and O. Oda,J. Electron. Mater. 20, 1013 (1991).