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Kriscinda A. Marks; Philip S. Fastenau; Paul H. Lysaker; Gary R. Bond. (2000). Self-Appraisal of Illness Questionnaire (SAIQ): relationship to researcher-rated insight and neuropsychological function in schizophrenia. , 45(3), 203–211. doi:10.1016/s0920-9964(99)00208-x 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research