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IEEE Transactions on Knowledge and Data Engineering > 2011 > 23 > 4 > 496 - 511
IEEE Internet Computing > 2011 > 15 > 6 > 24 - 31
IEEE Transactions on Knowledge and Data Engineering > 2011 > 23 > 4 > 496 - 511
IEEE Internet Computing > 2011 > 15 > 6 > 24 - 31