1. See, for example: R.A. Smith: Semiconductors, (Cambridge University Press, London, 1959) p. 222
2. See, for example: E. Garmire: In Integrated Optics, ed. T. Tamir (Springer, Berlin, Heidelberg 1979) p. 244
3. R.G. Hunsperger: Integrated Optics: Theory and Technology, Springer Ser. Opt. Sci., Vol. 33 (Springer, Berlin, Heidelberg 1982) p. 55
4. See, for example: G.A. Antypas: In GalnAsP Alloy Semiconductor, ed. by T.P. Pearsall (Wiley, New York 1982) p. 4
5. H.C. Casey, M.B. Parish: Heterostructure Lasers P. B: Material and Operating Characteristics (Academic, New York 1978) p. 25