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Turnbull, Andrew M.J.; Crawford, Geoffrey J.; Barrett, Graham D. . (2019). Methods for Intraocular Lens Power Calculation in Cataract Surgery after Radial Keratotomy. Ophthalmology, (), S0161642019319475–. doi:10.1016/j.ophtha.2019.08.019 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research