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2. Rassner, G.: Arch. klin. exp. Derm. 226, 111 (1966).
3. Saifeld, K.: Arch. klin. exp. Derm. 225, 82 (1966).
4. Saifeld, K.: Arch. klin. exp. Derm. 234, 213
5. Halprin, K. M., Ohkawara, A., Fukui, K.: Arch. Derm. 98, 80 (1968).