1. N. Yokoyama, T. Mimura, M. Fukuta and Hishikawa, Int. Solid-State Circuits Conf.,Dig. Tech. Papers 218 (1981).
2. K. Yamasaki, K. Asai, T. Mizutani and K. Kurumada,Electron. Lett. 18, 119 (1982).
3. T. Terada, Y. Kitaura, T. Mizoguchi, M. Mochizuki, N. Toyoda and A. Hojo, GaAs IC Symp., (1983).
4. A. Higashisaka, M. Ishikawa, F. Katano, S. Asai, T. Furutsuka,and Y. Takayama,15th Conf. on Solid-State Dev. and Mater. 69(1983).
5. K. Uetake, F. Katano, M. Kamiya, T. Misaki and A. Higashisaka,12th Int. Symp. on GaAs and Related Compounds, 505 (1985).