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H. A. H. Jongen; J. J. Denier; C. C. A. M. Gielen. (1989). Inhomogeneous activation of motoneurone pools as revealed by co-contraction of antagonistic human arm muscles. , 75(3), 555–562. doi:10.1007/bf00249906 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research