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Kajeepeta, Sandhya; Gelaye, Bizu; Jackson, Chandra L.; Williams, Michelle A. . (2015). Adverse childhood experiences are associated with adult sleep disorders: a systematic review. Sleep Medicine, 16(3), 320–330. doi:10.1016/j.sleep.2014.12.013 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research