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- "David Hilbert | Biography - German Mathematician." Encyclopedia Britannica Online. Encyclopedia Britannica, n.d. Web. 26 Feb. 2015. <http://www.britannica.com/EBchecked/topic/265698/David-Hilbert>.
- "David Hilbert." Facts & Biography. Famous Mathematicians, n.d. Web. 26 Feb. 2015. <http://famous-mathematicians.org/david-hilbert/>.
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