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Nacey, Nicholas C.; Fox, Michael G.; Luce, Barrett N.; Boatman, Dustin M.; Diduch, David R. . (2020). Assessing Femoral Trochlear Morphologic Features on Cross-Sectional Imaging Before Trochleoplasty: Dejour Classification Versus Quantitative Measurement. American Journal of Roentgenology, (), 1–7. doi:10.2214/AJR.19.22400 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research