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IEEE Communications Surveys & Tutorials > 2017 > 19 > 1 > 550 - 586
IEEE Communications Surveys & Tutorials > 2014 > 16 > 2 > 834 - 855
IEEE Communications Surveys & Tutorials > 2017 > 19 > 1 > 550 - 586
IEEE Communications Surveys & Tutorials > 2014 > 16 > 2 > 834 - 855