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IEEE Internet Computing > 2008 > 12 > 3 > 78 - 82
IEEE Transactions on Knowledge and Data Engineering > 2007 > 19 > 9 > 1202 - 1213
IEEE Internet Computing > 2008 > 12 > 3 > 78 - 82
IEEE Transactions on Knowledge and Data Engineering > 2007 > 19 > 9 > 1202 - 1213