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Frigg, A.; Magerkurth, O.; Valderrabano, V.; Ledermann, H.-P.; Hintermann, B. . (2007). The effect of osseous ankle configuration on chronic ankle instability. British Journal of Sports Medicine, 41(7), 420–424. doi:10.1136/bjsm.2006.032672 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research