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IEEE Transactions on Knowledge and Data Engineering > 2009 > 21 > 6 > 800 - 813
Proceedings of the IEEE > 2008 > 96 > 6 > 970 - 989
IEEE Transactions on Learning Technologies > 2008 > 1 > 1 > 49 - 62
IEEE Transactions on Knowledge and Data Engineering > 2009 > 21 > 6 > 800 - 813
Proceedings of the IEEE > 2008 > 96 > 6 > 970 - 989
IEEE Transactions on Learning Technologies > 2008 > 1 > 1 > 49 - 62