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Weigelt, Lizzy; Hartmann, Rebecca; Pfirrmann, Christian; Espinosa, Norman; Wirth, Stephan H. . (2019). Autologous Matrix-Induced Chondrogenesis for Osteochondral Lesions of the Talus: A Clinical and Radiological 2- to 8-Year Follow-up Study. The American Journal of Sports Medicine, (), 036354651984157–. doi:10.1177/0363546519841574 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research