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George Moukas; Philippos Gourzis; Ion N. Beratis; Stavroula Beratis. (2010). Sex differences in prepsychotic “prodromal” symptomatology and its association with Positive and Negative Syndrome Scale active phase psychopathology in male and female patients. , 51(5), 0–551. doi:10.1016/j.comppsych.2009.11.003 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research