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IEEE Systems Journal > 2016 > 10 > 2 > 507 - 519
IEEE Communications Surveys & Tutorials > 2016 > 18 > 3 > 2244 - 2281
IEEE Systems Journal > 2016 > 10 > 2 > 507 - 519
IEEE Communications Surveys & Tutorials > 2016 > 18 > 3 > 2244 - 2281