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IEEE Communications Surveys & Tutorials > 2014 > 16 > 2 > 745 - 760
IEEE Communications Surveys & Tutorials > 2010 > 12 > 3 > 422 - 438
IEEE Communications Surveys & Tutorials > 2014 > 16 > 2 > 745 - 760
IEEE Communications Surveys & Tutorials > 2010 > 12 > 3 > 422 - 438