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IEEE Communications Surveys & Tutorials > 2016 > 18 > 3 > 2149 - 2196
IEEE Communications Magazine > 2011 > 49 > 4 > 96 - 101
IEEE Communications Surveys & Tutorials > 2016 > 18 > 3 > 2149 - 2196
IEEE Communications Magazine > 2011 > 49 > 4 > 96 - 101