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Waffo, AF; Coombes, PH; Crouch, NR; Mulholland, DA; El Amin, SM; Smith, PJ (2007). “Acridone and furoquinoline alkaloids from Teclea gerrardii (Rutaceae: Toddalioideae) of southern Africa.”. Phytochemistry68 (5): 663–7. doi:10.1016/j.phytochem.2006.10.011. PMID17174364.