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Hardman, A. E.; Williams, C.; Boobis, L. H. . (1987). Influence of single‐leg training on muscle metabolism and endurance during exercise with the trained limb and the untrained limb. Journal of Sports Sciences, 5(2), 105–116. doi:10.1080/02640418708729770 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research