1. S. Margalit andA. Yariv, in ?Semiconductors and Semimetals?, edited by R. K. Willardson and A. C. Beer (Academic Press, New York, 1985) Vol. 22, Part E, p. 203.
2. I. Hayashi,Optoelectron. Devices Techn. 1 (1986) 1.
3. H. Matsueda, M. Hirao, T. P. Tanaka, H. Kodera andM. Nakamura, Proceedings of the International Symposium on GaAs and Releated Compounds, 1985 (Karuizawa), Institute of Physics Conference Series No. 79 (1986) p. 655.
4. S. R. Forrest,IEEE Trans. Electron. Devices ED-32 (1985) 2640.
5. O. Wada, T. Sakurai andT. Nakagami,IEEE J. Quantum Electron. QE-22 (1986) 805.