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IEEE Communications Surveys & Tutorials > 2015 > 17 > 4 > 2347 - 2376
IEEE Communications Magazine > 2013 > 51 > 11 > 63 - 71
IEEE Communications Surveys & Tutorials > 2015 > 17 > 4 > 2347 - 2376
IEEE Communications Magazine > 2013 > 51 > 11 > 63 - 71