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IEEE Communications Letters > 2011 > 15 > 4 > 440 - 442
IEEE Transactions on Communications > 2010 > 58 > 10 > 2939 - 2948
IEEE Communications Letters > 2011 > 15 > 4 > 440 - 442
IEEE Transactions on Communications > 2010 > 58 > 10 > 2939 - 2948