1. International Union of Biochemistry. Nomenclature Committee: Enzyme nomenclature. Academic Press, Inc., London, 1984.
2. Hoffmann-Ostenhof, O.: Enzymologie. Springer, Wien, 1954.
3. Kretschmar, H.: Technische Mikrobiologie. Paul Parey, Berlin, 1968.
4. Baruah, P., Swain, T.: Biochem. J. 87, 1963, S. 206.