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Renshaw, Ian; Chow, Jia Yi; Davids, Keith; Hammond, John . (2010). A constraints-led perspective to understanding skill acquisition and game play: a basis for integration of motor learning theory and physical education praxis?. Physical Education & Sport Pedagogy, 15(2), 117–137. doi:10.1080/17408980902791586 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research