@book{ BA21756439,
 author = "Steen, Lynn Arthur",
 title = "Heeding the call for change : suggestions for curricular action",
 publisher = "Mathematical Association of America",
 year = "1992",
 series = "MAA notes",
 number = "no. 22",
 URL = "https://ci.nii.ac.jp/ncid/BA21756439"
}
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