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Educational Studies in Mathematics > 2000 > 44 > 1-2 > 5-23
Educational Studies in Mathematics > 2000 > 44 > 1-2 > 5-23
Educational Studies in Mathematics > 2000 > 44 > 1-2 > 5-23
Educational Studies in Mathematics > 2000 > 44 > 1-2 > 5-23