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ARVE OPHEIM; REIDUN JAHNSEN; ELISABETH OLSSON; JOHAN K STANGHELLE. (2009). Walking function, pain, and fatigue in adults with cerebral palsy: a 7-year follow-up study. , 51(5), 381–388. doi:10.1111/j.1469-8749.2008.03250.x 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research