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Arslanian, Robert L.; Stermitz, Frank R.; Castedo, Luis . (1986). 3-Methoxy-5-hydroxyflavonols from Tillandsia purpurea. Journal of Natural Products, 49(6), 1177–1178. doi:10.1021/np50048a062 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research