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Mathew, J.; Alfredson, R. J. . (1984). The Condition Monitoring of Rolling Element Bearings Using Vibration Analysis. Journal of Vibration Acoustics Stress and Reliability in Design, 106(3), 447–. doi:10.1115/1.3269216 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research