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Faulkner, John A; Brooks, Susan V; Opiteck, Julie A . (1993). Injury to Skeletal Muscle Fibers During Contractions: Conditions of Occurrence and Prevention. Physical Therapy, 73(12), 911–921. doi:10.1093/ptj/73.12.911 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research