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Gadhiya, Satishkumar V.; Hu, Chunhua; Harding, Wayne W. . (2016). An alternative synthesis and x-ray crystallographic confirmation of (-)-stepholidine. Tetrahedron Letters, (), S0040403916303379–. doi:10.1016/j.tetlet.2016.03.108 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research