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WikiPedia: Ổ_đỡ_trục http://science.howstuffworks.com/bearing.htm http://kmoddl.library.cornell.edu/e-books.php http://kmoddl.library.cornell.edu/index.php http://www.msm.cam.ac.uk/phase-trans/2010/types/in... http://www.msm.cam.ac.uk/phase-trans/2011/Bearings... http://www.nbcgroup.co.uk/Bearings.aspx?PageID=55 https://web.archive.org/web/20160104230339/http://... https://commons.wikimedia.org/wiki/Category:Bearin...