2HertogMSc M G L, Feskens E J M, Hertog M G L, et al. Dietary antioxidant flavonoids and risk of coronary heart disease: the Zutphen Elderly Study[J]. THE lANCET,1993:1007 -1011.
3Havsteen B. Flavonoids. a class of natural products of high pharmacological potency. Biochem Pharmacol. 1983 : 1141 - 8.