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"incompleteness theorem". Oxford Dictionaries. Oxford University Press, n.d. Web. 23 October 2014.
<http://www.oxforddictionaries.com/definition/english/incompleteness-theorem>.

"incompleteness theorem". Oxford Dictionaries. Oxford University Press.
http://www.oxforddictionaries.com/definition/english/incompleteness-theorem (accessed October 23, 2014).