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IEEE Transactions on Learning Technologies > 2015 > 8 > 1 > 69 - 82
IEEE Intelligent Systems > 2011 > 26 > 1 > 40 - 47
IEEE Transactions on Learning Technologies > 2015 > 8 > 1 > 69 - 82
IEEE Intelligent Systems > 2011 > 26 > 1 > 40 - 47