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Mathematics Education Research Journal > 2011 > 23 > 4 > 455-477
Educational Studies in Mathematics > 2000 > 41 > 2 > 143-163
Technology, Knowledge and Learning > 1999 > 4 > 1 > 51-81
Mathematics Education Research Journal > 2011 > 23 > 4 > 455-477
Educational Studies in Mathematics > 2000 > 41 > 2 > 143-163
Technology, Knowledge and Learning > 1999 > 4 > 1 > 51-81