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Xiao-yang Lu; Jian-zhong Shen-Tu; Jian Liu. (2006). High-performance liquid chromatography–mass spectrometric analysis of ramipril and its active metabolite ramiprilat in human serum: Application to a pharmacokinetic study in the Chinese volunteers. , 40(2), 478–483. doi:10.1016/j.jpba.2005.07.054 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research