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Xiao Wang; Zhenjia Zheng; Xingfeng Guo; Jinpeng Yuan; Chengchao Zheng. (2011). Preparative separation of gingerols from Zingiber officinale by high-speed counter-current chromatography using stepwise elution. , 125(4), 1476–1480. doi:10.1016/j.foodchem.2010.10.066 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research