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IEEE Internet Computing > 2009 > 13 > 2 > 51 - 59
IEEE Transactions on Knowledge and Data Engineering > 2010 > 22 > 2 > 179 - 192
IEEE Internet Computing > 2009 > 13 > 2 > 51 - 59
IEEE Transactions on Knowledge and Data Engineering > 2010 > 22 > 2 > 179 - 192