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Takashi Sato; Yoshio Koga; Ten Sobue; Go Omori; Yuji Tanabe; Makoto Sakamoto. (2007). Quantitative 3-Dimensional Analysis of Preoperative and Postoperative Joint Lines in Total Knee Arthroplasty: A New Concept for Evaluation of Component Alignment. , 22(4), 0–568. doi:10.1016/j.arth.2006.06.020 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research