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|url=https://www.swissquant.com/wp-content/uploads/2017/09/Mathematical-Challenge-April-2013.pdf |archive-url=https://web.archive.org/web/20170912191717/https://www.swissquant.com/wp-content/uploads/2017/09/Mathematical-Challenge-April-2013.pdf |archive-date=2017-09-12 |url-status=live
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* {{cite book | first1 = Dave K. | last1 = Kythe |
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