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Murray, I. J.; Carden, D.; Makridaki, M. . (2011). The repeatability of the MPS 9000 macular pigment screener. British Journal of Ophthalmology, 95(3), 431–432. doi:10.1136/bjo.2010.195321 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research