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Elford BC; Roberts MF; Phillipson JD; Wilson RJ (1987). "Potentiation of the antimalarial activity of qinghaosu by methoxylated flavones". Trans R Soc Trop Med Hyg. 81 (3): 434–436. doi:10.1016/0035-9203(87)90161-1. PMID3318019.