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Löwe, Bernd; Decker, Oliver; Müller, Stefanie; Brähler, Elmar; Schellberg, Dieter; Herzog, Wolfgang; Herzberg, Philipp Yorck . (2008). Validation and Standardization of the Generalized Anxiety Disorder Screener (GAD-7) in the General Population. Medical Care, 46(3), 266–274. doi:10.1097/mlr.0b013e318160d093 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research