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IEEE Communications Surveys & Tutorials > 2017 > 19 > 1 > 587 - 618
IEEE Communications Surveys & Tutorials > 2011 > 13 > 4 > 673 - 687
IEEE Communications Surveys & Tutorials > 2017 > 19 > 1 > 587 - 618
IEEE Communications Surveys & Tutorials > 2011 > 13 > 4 > 673 - 687