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IEEE Communications Surveys & Tutorials > 2009 > 11 > 2 > 74 - 86
IEEE Transactions on Wireless Communications > 2008 > 7 > 9 > 3446 - 3456
IEEE Communications Surveys & Tutorials > 2009 > 11 > 2 > 74 - 86
IEEE Transactions on Wireless Communications > 2008 > 7 > 9 > 3446 - 3456