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IEEE Communications Letters > 2011 > 15 > 4 > 425 - 427
IEEE Transactions on Wireless Communications > 2011 > 10 > 3 > 782 - 791
IEEE Communications Letters > 2011 > 15 > 4 > 425 - 427
IEEE Transactions on Wireless Communications > 2011 > 10 > 3 > 782 - 791