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IEEE Transactions on Education > 2011 > 54 > 4 > 667 - 674
IEEE Transactions on Education > 2010 > 53 > 1 > 38 - 45
IEEE Transactions on Education > 2011 > 54 > 4 > 667 - 674
IEEE Transactions on Education > 2010 > 53 > 1 > 38 - 45