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RENGSTORFF, ROY H.; DOUGHTY, CECILIA B. . (1982). Mydriatic and Cycloplegic Drugs. Optometry and Vision Science, 59(2), 162–177. doi:10.1097/00006324-198202000-00008 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research