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Xiao-Wu Chen; Erini S. Serag; Kevin B. Sneed; Shu-Feng Zhou. (2011). Herbal bioactivation, molecular targets and the toxicity relevance. , 192(3), 161–176. doi:10.1016/j.cbi.2011.03.016 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research