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IEEE Transactions on Learning Technologies > 2016 > 9 > 3 > 244 - 257
IEEE Transactions on Education > 2015 > 58 > 1 > 1 - 6
IEEE Transactions on Learning Technologies > 2016 > 9 > 3 > 244 - 257
IEEE Transactions on Education > 2015 > 58 > 1 > 1 - 6