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Written and oral mathematics. Abstract and comments prepared for I.M.E. by Judith T. Sowder, San Diego State University. Schriftliche und muendliche Mathematik. Zusammenfassung und Kommentar. (English)
Invest. Math. Educ. (Win 1987) v. 20(1) p. 18-21. Originally published in: Journal for Research in Mathematics Education, March 1987, v. 18, p. 83-97.
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