1. A detailed analysis of laser diodes and heterojunction LEDs is presented in H.Kressel, J. K. Butler: Semiconductor Lasers and Heterojunction LEDs (Academic Press, New York 1977)
2. H.Kressel, H.Nelson: “Properties and Applications of III–V Compound Films Deposited by Liquid Phase Epitaxy”,in Physics of Thin Films, ed. by G. Hass, M. H. Francombe, R. W. Hoffman (Academic Press, New York 1973)
3. For a review of this extensive literature, see J.J. Tietjen, V. S. Ban, R. E. Enstrom, D. Richman J. Vac. Sci. Technol. 8, 56 (1971)
4. A. Y. Cho: J. Vac. Sci. Technol. 8, 531 (1971)
5. A.Many, Y.Goldstein, N.B.Grover: Semiconductor Surfaces (North-Holland, Amsterdam 1965)