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Alexis M. Stranahan; Kim Lee; Kevin G. Becker; Yonqing Zhang; Stuart Maudsley; Bronwen Martin; Roy G. Cutler; Mark P. Mattson. (2010). Hippocampal gene expression patterns underlying the enhancement of memory by running in aged mice. , 31(11), 0–1949. doi:10.1016/j.neurobiolaging.2008.10.016 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research