@book{ BB00100695, author = "Comprehensive School Mathematics Program and Central Midwestern Regional Educational Laboratory", title = "The integers", publisher = "CEMREL", year = "1973", series = "Elements of mathematics / Comprehensive School Mathematics Program", number = "bk. 0 . Intuitive background ; ch. 2", URL = "https://ci.nii.ac.jp/ncid/BB00100695" }

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