yishs Gray [5 articles]
Mathematics Teaching, Vol. 142 (1993), pp. 6-10.
Journal of the Learning Sciences, Vol. 12, No. 4. (2003), pp. 495-547.
Educational Studies in Mathematics, Vol. 38 (1999), pp. 111-133.
Journal for Research in Mathematics Education, Vol. 25, No. 2. (1994), pp. 116-140.
(2004)
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