1. E.E. Bell: Optical Constants and their Measurement, inLight and Matter Ia, ed. by L. Genzel,Handbuch der Physik ?Encyclopedia of Physics, Vol. XXV/2a (Springer, Berlin, Heidelberg (1967) pp. 1?58
2. U. Nowak, J. Saalm�ller, W. Richter, M. Heyen, H. Janz: Appl. Phys. A35, 27 (1984)
3. P. Grosse, B. Heinz: Proc. 9th Intern. Conf. on Infrared and Millimeter Waves, ed. by K. Mizuno (Takarazuka, 1984) pp. 77?78
4. Z. Knittl:Optics of Thin Films (Wiley, London 1976) Chap. 2, pp. 35?49
5. L. Harris, J.K. Beasley, A.L. Leob: J. Opt. Soc. Am.41, 604 (1951)