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IEEE Communications Surveys & Tutorials > 2009 > 11 > 1 > 33 - 51
IEEE Transactions on Communications > 2008 > 56 > 7 > 1056 - 1059
IEEE Communications Surveys & Tutorials > 2009 > 11 > 1 > 33 - 51
IEEE Transactions on Communications > 2008 > 56 > 7 > 1056 - 1059