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IEEE Communications Magazine > 2017 > 55 > 3 > 62 - 67
IEEE Transactions on Wireless Communications > 2017 > 16 > 1 > 551 - 564
IEEE Communications Surveys & Tutorials > 2016 > 18 > 4 > 2624 - 2661
IEEE Access > 2015 > 3 > 430 - 444