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Goverdhan Mehta; Srinivasarao Yaragorla. (2011). Model synthetic studies toward the central 7/8/5 tricarbocyclic core of complex Schisanartane-type nortriterpenoids. , 52(34), 4485–4489. doi:10.1016/j.tetlet.2011.06.079 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research