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Min Ye; Hui Guo; Hongzhu Guo; Jian Han; Dean Guo. (2006). Simultaneous determination of cytotoxic bufadienolides in the Chinese medicine ChanSu by high-performance liquid chromatography coupled with photodiode array and mass spectrometry detections. , 838(2), 86–95. doi:10.1016/j.jchromb.2006.04.042 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research