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Solomon, Caren G.; Volkow, Nora D.; Swanson, James M. . (2013). Adult Attention Deficit–Hyperactivity Disorder. New England Journal of Medicine, 369(20), 1935–1944. doi:10.1056/NEJMcp1212625 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research