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sci
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Keith R. Berend; Michael J. Morris; Michael D. Skeels; Adolph V. Lombardi; Joanne B. Adams. (2011). Perioperative Complications of Simultaneous versus Staged Unicompartmental Knee Arthroplasty. , 469(1), 168–173. doi:10.1007/s11999-010-1492-4 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research