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Michael S. Jellinek; J. Michael Murphy; John Robinson; Anita Feins; Sharon Lamb; Terrence Fenton. (1988). Pediatric Symptom Checklist: Screening school-age children for psychosocial dysfunction. , 112(2), 201–209. doi:10.1016/s0022-3476(88)80056-8 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research