@book{ BA12853955,
 author = "Stigler, James W. and Lee, Shin-Ying and Stevenson, Harold William",
 title = "Mathematical knowledge of Japanese, Chinese, and American elementary school children",
 publisher = "National Council of Teachers of Mathematics",
 year = "1990",
 URL = "https://ci.nii.ac.jp/ncid/BA12853955"
}
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