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IEEE Communications Letters > 2009 > 13 > 6 > 411 - 413
IEEE Transactions on Wireless Communications > 2009 > 8 > 1 > 424 - 431
IEEE Communications Letters > 2009 > 13 > 6 > 411 - 413
IEEE Transactions on Wireless Communications > 2009 > 8 > 1 > 424 - 431