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Barbara C. Galland; Gavin J. Kennedy; Edwin A. Mitchell; Barry J. Taylor. (2012). Algorithms for using an activity-based accelerometer for identification of infant sleep–wake states during nap studies. , 13(6), 0–. doi:10.1016/j.sleep.2012.01.018 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research