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IEEE Transactions on Learning Technologies > 2014 > 7 > 2 > 142 - 154
IEEE Transactions on Learning Technologies > 2008 > 1 > 3 > 145 - 156
IEEE Transactions on Learning Technologies > 2014 > 7 > 2 > 142 - 154
IEEE Transactions on Learning Technologies > 2008 > 1 > 3 > 145 - 156