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History of the formulas and algorithms for $\pi $ / / Jesús Guillera --http://www.ams.org/conm/517/http://dx.doi.org/10.1090/conm/517/10140
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2010
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1
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History Of The Foundation Of The UN / / Helmut Volger --
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2010
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1
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The history of the Franconian tone contrast / / Boersma, Paul --
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2017
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1
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