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Sarks, J.; Arnold, J.; Ho, I.-V.; Sarks, S.; Killingsworth, M. . (2011). Evolution of reticular pseudodrusen. British Journal of Ophthalmology, 95(7), 979–985. doi:10.1136/bjo.2010.194977 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research