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Clemson, C. M.; Tzekov, R.; Checchi, J. M.; Krebs, M.; Kaushal, S. . (2011). Authors' response. British Journal of Ophthalmology, 95(1), 153–154. doi:10.1136/bjo.2010.195768 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research