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IEEE Transactions on Education > 2015 > 58 > 3 > 203 - 207
IEEE Transactions on Learning Technologies > 2015 > 8 > 1 > 98 - 110
IEEE Transactions on Learning Technologies > 2015 > 8 > 1 > 124 - 135
IEEE Transactions on Learning Technologies > 2015 > 8 > 1 > 43 - 54