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O. Suzuki; H. Hattori; M. Asano; T. Takahashi; H. Brandenberger. (1987). Positive and negative ion mass spectrometry of benzophenones, the acid-hydrolysis products of benzodiazepines. , 98(1), 1–10. doi:10.1007/bf00200380 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research