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Baris 35:
* {{en}} [http://www.epa.gov/garbage/tires/basic.htm US Environmental Protection Agency]
* {{en}} [http://www.charityguide.org/volunteer/fewhours/used-tires.htm Used Tires: Reuse, Recycle, Retread]
* {{en}} [http://www.physics.sc.edu/~rjones/phys101/tirefriction.html Jones and Chiders. "Tire Friction." Physics 101. 2001.]
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