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IEEE Transactions on Knowledge and Data Engineering > 2011 > 23 > 6 > 875 - 888
IEEE Internet Computing > 2008 > 12 > 4 > 46 - 54
IEEE Transactions on Knowledge and Data Engineering > 2011 > 23 > 6 > 875 - 888
IEEE Internet Computing > 2008 > 12 > 4 > 46 - 54