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Clarys, J. P.; Martin, A. D.; Drinkwater, D. T.; Marfell‐Jones, M. J. . (1987). The skinfold: Myth and reality∗. Journal of Sports Sciences, 5(1), 3–33. doi:10.1080/02640418708729760 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research