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Mumma, Gregory H.. (2004). Validation of Idiosyncratic Cognitive Schema in Cognitive Case Formulations: An Intraindividual Idiographic Approach.. Psychological Assessment, 16(3), 211–230. doi:10.1037/1040-3590.16.3.211 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research