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Jiu-liang Zhang; Hui Wang; Hui-fang Pi; Han-li Ruan; Peng Zhang; Ji-zhou Wu. (2009). Structural analysis and antitussive evaluation of five novel esters of verticinone and bile acids. , 74(4-5), 0–434. doi:10.1016/j.steroids.2008.12.007 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research