1. Barth, J., Kipping, D.: Unter Hormontherapie aufgetretene Porphyria cutanea tarda mit anhaltender Porphyrinausscheidung. Derm. Mschr.157, 160?167 (1971).
2. Bock, K. W., Krauss, E., Fr�hling, W.: Regulation of?-ALA-Synthetase by drugs and steroids in vivo and in isolated perfused rat liver. Europ. J. Biochem.23, 366?371 (1971).
3. Brunsting, L. A.: Diskussion Arch. Derm.92, 289?290 (1965).
4. Campion, H. D. L., Wilson, H. T. H.: Porphyria. Trans. St. John's Hosp. derm. Soc. (Lond.)51, 128?129 (1965).
5. Copeman, P. W. M., Cripps, D. J., Summerly, R.: Cutaneous hepatic porphyria and estrogens, Brit. med. J.1966 I, 461?463.