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T.R. Govindachari; G.N. Krishna Kumari; G. Suresh. (1995). Triterpenoids from Walsura piscidia. , 39(1), 167–170. doi:10.1016/0031-9422(94)00851-j 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research