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China Communications > 2017 > 14 > 10 > 202 - 218
IEEE Communications Surveys & Tutorials > 2011 > 13 > 2 > 183 - 198
China Communications > 2017 > 14 > 10 > 202 - 218
IEEE Communications Surveys & Tutorials > 2011 > 13 > 2 > 183 - 198