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Kinnear, B. Z.; Lannin, N. A.; Cusick, A.; Harvey, L. A.; Rawicki, B. . (2014). Rehabilitation Therapies After Botulinum Toxin-A Injection to Manage Limb Spasticity: A Systematic Review. Physical Therapy, 94(11), 1569–1581. doi:10.2522/ptj.20130408 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research