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Proakis, Anthony G.; Harris, Gladys B. . (1978). Comparative Penetration of Glycopyrrolate and Atropine across the Blood???Brain and Placental Barriers in Anesthetized Dogs. Anesthesiology, 48(5), 339–344. doi:10.1097/00000542-197805000-00007 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research