1. Allen, B. T., Ingram, D. J. E.: The investigation of unpaired electron concentrations produced in large molecules by ultraviolet irradiation. In: Free radicals in biological systems, p. 215. Blois, M. S., Brown, H. W., Lemmon, R. M., Lindblom, R. O., Weissbluth, M., Eds. New York: Academic Press 1961.
2. Anson, M. L.: The estimation of pepsin, trypsin, papain and cathepsin with hemoglobin. J. gen. Physiol.22, 79 (1939).
3. Augenstein, L. G., Ghiron, C. A.: The inactivation of trypsin by UV light. I. The correlation of inactivation with the disruption of constituent cystine. Proc. nat. Acad. Sci. (Wash.)47, 1530 (1961).
4. —, Ray, B. R.: Trypsin monolayers at the air-water interface. III. Structure postulates on inactivation. J. Phys. Chem.61, 1385 (1957).
5. Bergmeyer, H. U.: Methoden der enzymatischen Analyse, S. 807. Weinheim (Bergstr.): Verlag Chemie 1962.