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Calissendorff, J.; Ljung, R. . (2011). Thyroxin substitution and open-angle glaucoma: a nationwide register-based study on filled prescriptions. British Journal of Ophthalmology, 95(4), 592–594. doi:10.1136/bjo.2010.195032 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research