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Yang, Yi; Zhao, Yongxin; Gu, Dongyu; Ayupbek, Amatjan; Huang, Yun; Dou, Jun; Ito, Yoichiro; Zhang, Tianyou; Aisa, Haji Akber . (2010). SEPARATION OF THE MINOR FLAVONOLS FROM <i>FLOS GOSSYPII</i> BY HIGH-SPEED COUNTERCURRENT CHROMATOGRAPHY. Journal of Liquid Chromatography & Related Technologies, 33(16), 1502–1515. doi:10.1080/10826076.2010.489000 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research