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Stefan Leucht; John M. Kane; Werner Kissling; Johannes Hamann; Eva Etschel; Rolf R. Engel. (2005). What does the PANSS mean?. , 79(2-3), 231–238. doi:10.1016/j.schres.2005.04.008 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research