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J. Dul; G.E. Johnson; R. Shiavi; M.A. Townsend. (1984). Muscular synergism—II. A minimum-fatigue criterion for load sharing between synergistic muscles. , 17(9), 675–684. doi:10.1016/0021-9290(84)90121-0 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research