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Schweizerische Medizinische Wochenschrift|October 26, 1991
[Khat, a herbal drug with amphetamine properties]P Kalix, R Brenneisen, U Koelbing, et al.
British Journal of Clinical Pharmacology|December 1, 1990
Amphetamine-like effects in humans of the khat alkaloid cathinoneR Brenneisen, H U Fisch, U Koelbing, et al.
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