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Chen, Chuan; Qiang, Shigao; Lou, Liguang; Zhao, Weimin . (2009). Cucurbitane-Type Triterpenoids from the Stems of <i>Cucumis melo</i>. Journal of Natural Products, 72(5), 824–829. doi:10.1021/np800692t 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research