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2. Karlson, P., Gerok, W., Groß, W.: Pathobiochemie, S. 105. Stuttgart: Thieme 1978
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4. Foote, C.S., et al.: Tetrahedron 23, 2583 (1967)
5. Blum, H.F.: Photodynamic Action and Diseases Caused by Light, p. 133. New York: Hafner 1964