1. Balda, B.-R.,et al.: Naturwissenschaften57, 548 (1970).
2. Birkmayer, G. D.,et al.: ibid.59, 369 (1972).
3. Balda, B.-R., Birkmayer, G. D., Braun-Falco, O.: 1st Joint Meeting of the Society for Investigative Dermatology and the European Society for Dermatological Research, Amsterdam 1972.
4. Balda, B.-R. Birkmayer, G. D., Braun-Falco, O.: Arch. Derm. Res. (in press).
5. Birkmayer, G. D., Miller, F., Balda, B.-R.: Hoppe-Seyler's Z. physiol. Chem.353, 1749 (1972).