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- Skocpol, William, PhD. Professor of Physics, Boston University. Personal correspondence. October 31, 2008.
- Townsend, Ben. "Static and kinetic friction." University of Alaska, Fairbanks. Fall 2002. http://ffden-2.phys.uaf.edu/211_fall2002.web.dir/Ben_Townsend/StaticandKineticFriction.htm