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IEEE Communications Surveys & Tutorials > 2015 > 17 > 4 > 2347 - 2376
IEEE Internet Computing > 2009 > 13 > 2 > 36 - 43
IEEE Communications Surveys & Tutorials > 2015 > 17 > 4 > 2347 - 2376
IEEE Internet Computing > 2009 > 13 > 2 > 36 - 43