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R.Grant Steen; Jason Schroeder. (2003). Age-related changes in the pediatric brain: proton T1 in healthy children and in children with sickle cell disease. , 21(1), 9–15. doi:10.1016/s0730-725x(02)00635-5 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research