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Beynnon, B. D.. (2005). The Relationship Between Menstrual Cycle Phase and Anterior Cruciate Ligament Injury: A Case-Control Study of Recreational Alpine Skiers. American Journal of Sports Medicine, 34(5), 757–764. doi:10.1177/0363546505282624 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research