1. Brune, G.; Schoberth, S.M.; Sahm, H.: Process Biochem. 1982, May/June, 20?24
2. Ghosh, S.; Klass, D.L. (1978): Process Biochem. 13, 15?24
3. Katac, B.; Vejdelek, Z. J. (1974) Eds.: Handbuch der photometrischen Analyse, Vol. 3; Weinheim: Verlag Chemie, 968?969
4. Lescure, J.P.; Bourlet, P. (1980): Sucr. fran�. 121, 127?131
5. Rombouts, F.M. (1980): Adv. Biochem. 4 (Proceedings 5th Int. Yeast Symp., London, Canada), 585?592