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Dolezal, Brett A.; Neufeld, Eric V.; Boland, David M.; Martin, Jennifer L.; Cooper, Christopher B. . (2017). Interrelationship between Sleep and Exercise: A Systematic Review. Advances in Preventive Medicine, 2017(), 1–14. doi:10.1155/2017/1364387 

An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research