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IEEE Communications Surveys & Tutorials > 2016 > 18 > 1 > 848 - 859
IEEE Intelligent Systems > 2015 > 30 > 3 > 26 - 34
IEEE Communications Surveys & Tutorials > 2016 > 18 > 1 > 848 - 859
IEEE Intelligent Systems > 2015 > 30 > 3 > 26 - 34