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Rassier, Dilson E; Tubman, L Aaron; MacIntosh, Brian R . (1998). Caffeine and length dependence of staircase potentiation in skeletal muscle. Canadian Journal of Physiology and Pharmacology, 76(10-11), 975–982. doi:10.1139/y98-117 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research