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Dubois, B.; Pillon, B.; Sternic, N.; Lhermitte, F.; Agid, Y. . (1990). Age-induced cognitive disturbances in Parkinson's disease. Neurology, 40(1), 38–38. doi:10.1212/WNL.40.1.38 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research