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IEEE Communications Surveys & Tutorials > 2016 > 18 > 3 > 2220 - 2243
IEEE Communications Surveys & Tutorials > 2011 > 13 > 2 > 291 - 307
IEEE Communications Surveys & Tutorials > 2016 > 18 > 3 > 2220 - 2243
IEEE Communications Surveys & Tutorials > 2011 > 13 > 2 > 291 - 307