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IEEE Transactions on Knowledge and Data Engineering > 2015 > 27 > 1 > 193 - 206
IEEE Transactions on Learning Technologies > 2015 > 8 > 1 > 111 - 123
IEEE Transactions on Knowledge and Data Engineering > 2015 > 27 > 1 > 193 - 206
IEEE Transactions on Learning Technologies > 2015 > 8 > 1 > 111 - 123