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IEEE Transactions on Knowledge and Data Engineering > 2007 > 19 > 2 > 261 - 272
IEEE Transactions on Knowledge and Data Engineering > 2008 > 20 > 4 > 547 - 561
IEEE Transactions on Knowledge and Data Engineering > 2007 > 19 > 2 > 261 - 272
IEEE Transactions on Knowledge and Data Engineering > 2008 > 20 > 4 > 547 - 561