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Educational Studies in Mathematics > 2014 > 86 > 1 > 125-149
Educational Studies in Mathematics > 2007 > 66 > 1 > 3-21
Educational Studies in Mathematics > 2007 > 66 > 1 > 23-41
Educational Studies in Mathematics > 2014 > 86 > 1 > 125-149
Educational Studies in Mathematics > 2007 > 66 > 1 > 3-21
Educational Studies in Mathematics > 2007 > 66 > 1 > 23-41