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D.E. Moss; Patricia Z. Manderscheid; S.P. Montgomery; Andrew B. Norman; Paul R. Sanberg. (1989). Nicotine and cannabinoids as adjuncts to neuroleptics in the treatment of tourette syndrome and other motor disorders. , 44(21), 1521–1525. doi:10.1016/0024-3205(89)90444-x 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research