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IEEE Transactions on Education > 2009 > 52 > 1 > 169 - 176
IEEE Transactions on Education > 2009 > 52 > 1 > 39 - 45
IEEE Transactions on Education > 2009 > 52 > 1 > 169 - 176
IEEE Transactions on Education > 2009 > 52 > 1 > 39 - 45