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Zhou, Yuxin; Bosman, Rob; Lugt, Piet M. . (2019). An Experimental Study on Film Thickness in a Rolling Bearing for Fresh and Mechanically Aged Lubricating Greases. Tribology Transactions, 62(4), 557–566. doi:10.1080/10402004.2018.1539202 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research