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IEEE Transactions on Learning Technologies > 2012 > 5 > 2 > 104 - 116
IEEE Transactions on Education > 2011 > 54 > 1 > 114 - 124
IEEE Transactions on Learning Technologies > 2012 > 5 > 2 > 104 - 116
IEEE Transactions on Education > 2011 > 54 > 1 > 114 - 124