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IEEE Communications Surveys & Tutorials > 2011 > 13 > 2 > 150 - 167
IEEE Internet Computing > 2010 > 14 > 3 > 58 - 67
IEEE Communications Surveys & Tutorials > 2011 > 13 > 2 > 150 - 167
IEEE Internet Computing > 2010 > 14 > 3 > 58 - 67