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Archer, David T.; Drysdale, Kristian; Bradley, Edward J. . (2016). Differentiating technical skill and motor abilities in selected and non-selected 3–5year old team-sports players. Human Movement Science, 47(), 81–87. doi:10.1016/j.humov.2016.02.001 

An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research