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Egan, Linda M.; Watts, Phillip B.; Silta, Barbara C. . (1987). Changes in serum haptoglobin as an acute response to a marathon road race. Journal of Sports Sciences, 5(1), 55–60. doi:10.1080/02640418708729764 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research