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K. L. Rasmussen; C. S. Laugesen; L. Ringholm; M. Vestgaard; P. Damm; E. R. Mathiesen. (2010). Progression of diabetic retinopathy during pregnancy in women with type 2 diabetes. , 53(6), 1076–1083. doi:10.1007/s00125-010-1697-9 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research