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. by T. Tamir (Springer, Berlin, Heidelberg 1979) p. 244; R.G. Hunsperger: Integrated Optics: Theory and Technology, Springer Ser. Opt. Sci., Vol. 33 (Springer, Berlin, Heidelberg 1982) p. 55
3. See, for example: G.A. Antypas: In GaInAsP Alloy Semiconductor, ed. by T.P. Pearsall (Wiley, New york 1982) p. 4; H.C. Casey, M.B. Parish: Heterostructure Lasers Pt. B: Material and Operating Characteristics (Academic, New York 1978) p. 25
4. H.C. Casey, M.B. Parish: ibid, p. 17
5. A.A. Berg, P.T. Dean: Proc. IEEE 160, 156 (1972)