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IEEE Transactions on Wireless Communications > 2011 > 10 > 2 > 693 - 701
IEEE Communications Letters > 2011 > 15 > 4 > 446 - 448
IEEE Transactions on Wireless Communications > 2011 > 10 > 2 > 693 - 701
IEEE Communications Letters > 2011 > 15 > 4 > 446 - 448