@book{ BA1225885X,
 author = "Krulik, Stephen and Reys, Robert E.",
 title = "Problem solving in school mathematics",
 publisher = "National Council of Teachers of Mathematics",
 year = "1980",
 series = "Yearbook / National Council of Teachers of Mathematics",
 number = "1980",
 URL = "https://ci.nii.ac.jp/ncid/BA1225885X"
}
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