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Ogden, Russel D.. (2010). Observation of Two Suicides by Helium Inhalation in a Prefilled Environment. The American Journal of Forensic Medicine and Pathology, 31(2), 156–161. doi:10.1097/PAF.0b013e3181d749d7 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research