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ਲਾਈਨ 13:
*[http://books.google.com/books?id=WDll8hA006AC&pg=PT2503&lpg=PT2503 CRC Handbook of Chemistry & Physics – Values for Coefficient of Friction]
*[http://chain-guide.com/basics/2-3-1-coefficient-of-friction.html Characteristic Phenomena in Conveyor Chain]
*[http://nsfafresh.org Atomic-scale Friction Research and Education Synergy Hub (AFRESH)] {{Webarchive|url=https://web.archive.org/web/20080511205842/http://www.nsfafresh.org/ |date=2008-05-11 }} an Engineering Virtual Organization for the atomic-scale friction community to share, archive, link, and discuss data, knowledge and tools related to atomic-scale friction.
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