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Carson, Michael P.; Frank, Matthew I.; Keely, Erin . (2013). Original research: Postpartum testing rates among women with a history of gestational diabetes—Systematic review. Primary Care Diabetes, 7(3), 177–186. doi:10.1016/j.pcd.2013.04.007 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research