[1] R. J. Fu et al., Appl. Phys. Lett., 45(7) , 716 (1984)

[2] D. Botez, Appl. Phys. Lett., 36(3), 190(1980)

[3] К. H;;mada et al., IEΕΕ J. Quant. Electr., QE-21(6), 623(1985)

[4] Y. Suzuki et al., Electron. Lett., 20(9), 3S3(1984)

[5] H. Blauveit et al., Appl. Phys. Lett., 40(12), 1029(1982)

[6] H. C. Casey, Jr., Μ. B. Panish, Heterostructure Lasers (Academic Press, New York, 1978), p. 183

[7] K. Funakoshi et al., J. Crystal Growth, 45, 252 (1978)

[8] D. Botez, J. Crystal Growth, 70, 100(1984)