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IEEE Communications Surveys & Tutorials > 2013 > 15 > 2 > 621 - 653
IEEE Communications Surveys & Tutorials > 2013 > 15 > 2 > 551 - 591
IEEE Communications Surveys & Tutorials > 2013 > 15 > 2 > 621 - 653
IEEE Communications Surveys & Tutorials > 2013 > 15 > 2 > 551 - 591