1. Kubelka, P., Munk, F. (1931): Z. techn. Phys. 12:593
2. Kortüm G (1969): Reflexionsspektroskopie. Springer, Berlin
3. Ferraro, J. R., Rein, A. J. (1985) in: Ferraro, J. R., Basile, L. J. (eds.) Fourier Transform Infrared Spectroscopy, vol. 4. Academic Press, Orlando/Fla., p. 244
4. Osborne, B. G., Fearn, T. (1986): Near Infrared Spectroscopy in Food Analysis. Wiley, New York
5. Hecht, H. G. (1976): Anal. Chem. 48:1775;