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Burgar, Charles G.; Lum, Peter S.; Scremin, A. M. Erika; Garber, Susan L.; Van der Loos, H. F. Machiel; Kenney, Deborah; Shor, Peggy . (2011). Robot-assisted upper-limb therapy in acute rehabilitation setting following stroke: Department of Veterans Affairs multisite clinical trial. The Journal of Rehabilitation Research and Development, 48(4), 445–. doi:10.1682/JRRD.2010.04.0062 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research