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IEEE Transactions on Learning Technologies > 2010 > 3 > 2 > 96 - 109
IEEE Transactions on Education > 2010 > 53 > 1 > 120 - 127
IEEE Transactions on Learning Technologies > 2010 > 3 > 2 > 96 - 109
IEEE Transactions on Education > 2010 > 53 > 1 > 120 - 127