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Mathew, R. G.; Murdoch, I. E. . (2011). The silent enemy: a review of cataract in relation to glaucoma and trabeculectomy surgery. British Journal of Ophthalmology, 95(10), 1350–1354. doi:10.1136/bjo.2010.194811 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research