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Spitzer, Robert L.; Kroenke, Kurt; Williams, Janet B. W.; Löwe, Bernd . (2006). A Brief Measure for Assessing Generalized Anxiety Disorder. Archives of Internal Medicine, 166(10), 1092–. doi:10.1001/archinte.166.10.1092 

An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research