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Janssen, Ian; Heymsfield, Steven B.; Wang, ZiMian; Ross, Robert . (2000). Skeletal muscle mass and distribution in 468 men and women aged 18–88 yr. Journal of Applied Physiology, 89(1), 81–88. doi:10.1152/jappl.2000.89.1.81 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research