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Glover, S. J.; Burgess, P. I.; Cohen, D. B.; Harding, S. P.; Hofland, H. W. C.; Zijlstra, E. E.; Allain, T. J. . (2012). Prevalence of diabetic retinopathy, cataract and visual impairment in patients with diabetes in sub-Saharan Africa. British Journal of Ophthalmology, 96(2), 156–161. doi:10.1136/bjo.2010.196071 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research