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Princeton, N.J. [usw.]: van Nostrand, 1960
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New York, NY: Springer, 1960
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Informa UK Limited, 2002
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Mathematical Association of America, 2002
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National Council of Teachers of Mathematics, 2002
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National Council of Teachers of Mathematics, 2003
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Informa UK Limited, 2002
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Mathematical Association of America, 2002
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Informa UK Limited, 2002
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Informa UK Limited, 2002
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Mathematical Association of America, 2002
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National Council of Teachers of Mathematics, 2000
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Informa UK Limited, 1998
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Mathematical Association of America, 1997
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Informa UK Limited, 1997
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Informa UK Limited, 1997
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Mathematical Association of America, 1998
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Informa UK Limited, 1998
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Informa UK Limited, 1998
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Mathematical Association of America, 1998