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Washington, D.C.: Mathematical Association of America, 1978
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Stuttgart: Klett, 1990
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Stuttgart: Klett, 1983
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Moskva: Nauka, 1978
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Informa UK Limited, 1981
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JSTOR, 1981
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Mathematical Association of America, 1981
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Informa UK Limited, 1982
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JSTOR, 1982
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National Council of Teachers of Mathematics, 1981
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Mathematical Association of America, 1982
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National Council of Teachers of Mathematics, 1981
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Informa UK Limited, 1980
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JSTOR, 1980
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National Council of Teachers of Mathematics, 1979
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Mathematical Association of America, 1980
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National Council of Teachers of Mathematics, 1979
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Informa UK Limited, 1980
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JSTOR, 1980
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Mathematical Association of America, 1980