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Sources

• "amorphous solid." Encyclopædia Britannica. Encyclopædia Britannica Online. Encyclopædia Britannica, 2011. Web. (May 2, 2011) http://www.britannica.com/EBchecked/topic/21328/amorphous-solid
• Askeland, Donald R. and Pradeep Prabhakar Phulé. The Science of Engineering and Materials. Thomson. 2006. Chandler, David L. "Explained: Bandgap." MIT News. July 23, 2010. (May 2, 2011) http://web.mit.edu/newsoffice/2010/explained-bandgap-0723.html
• "glass." Encyclopædia Britannica. Encyclopædia Britannica Online. Encyclopædia Britannica, 2011. Web. (May 2, 2011) http://www.britannica.com/EBchecked/topic/234888/glass
• Kunzig, Robert. "The Physics of … Glass." Discover Magazine. October 1999. (May 2, 2011) http://discovermagazine.com/1999/oct/physics/?searchterm=glass