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Lee, Jung Keun; Robinovitch, Stephen N.; Park, Edward J. . (2015). Inertial Sensing-Based Pre-Impact Detection of Falls Involving Near-Fall Scenarios. IEEE Transactions on Neural Systems and Rehabilitation Engineering, 23(2), 258–266. doi:10.1109/TNSRE.2014.2357806 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research