1. Z. Prochazka, Chem. Listy58, 911 (1964).
2. A. J. P. Martin, Biochem. Soc. Symposia Cambridge3, 4 (1950).
3. A. B. Littlewood, Gas Chromatography, Academic Press, London-New York 1970.
4. I. E. Bush, Methods Biochem. Anal.13, 357 (1965).
5. Wawrzynowicz, T., Santus, M., Roczn. Chem.45, 629 (1970).