"Johann Franz Encke: Biography from Answers.com."Answers.com: Wiki Q&A combined with free online dictionary, thesaurus, and encyclopedias. N.p., n.d. Web. 6 Jan. 2011. <http://www.answers.com/topic/johann-franz-encke>"
"Wikipedia. "Johann Franz Encke ." Wikipedia, the free encyclopedia. N.p., n.d. Web. 6 Jan. 2011. <http://en.wikipedia.org/wiki/Johann_Franz_Encke>
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