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IEEE Communications Letters > 2008 > 12 > 9 > 699 - 701
IEEE Transactions on Antennas and Propagation > 2008 > 56 > 8-2 > 2496 - 2503
IEEE Communications Letters > 2008 > 12 > 9 > 699 - 701
IEEE Transactions on Antennas and Propagation > 2008 > 56 > 8-2 > 2496 - 2503