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Chunjian Zhao; Chunying Li; Yuangang Zu. (2007). Rapid and quantitative determination of solanesol in Nicotiana tabacum by liquid chromatography–tandem mass spectrometry. , 44(1), 35–40. doi:10.1016/j.jpba.2007.01.021 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research