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"Endothermic and Exothermic Reactions". University of Minnesota. 2 March 2008                          <http://www.chem.umn.edu/outreach/EndoExo.html>.

Gray, Theodore. "Icy Hot". Popular Science October 2007: 80-80.

"Liquid Endothermic and Exothermic Reactions". Encyclopedia Britannica. New York City:   n             Encyclopedia Britannica Incorporated, 2007

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