@book{ BA33005284,
 author = "Piaget, Jean and Gattegno, Caleb and Hodgson, F. M.",
 title = "The child's conception of number",
 publisher = "Routledge",
 year = "1997",
 series = "Jean Piaget : selected works",
 number = "v. 2",
 URL = "https://ci.nii.ac.jp/ncid/BA33005284"
}
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