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IEEE Communications Letters > 2014 > 18 > 9 > 1575 - 1578
IEEE Transactions on Antennas and Propagation > 2008 > 56 > 2 > 437 - 449
IEEE Communications Letters > 2014 > 18 > 9 > 1575 - 1578
IEEE Transactions on Antennas and Propagation > 2008 > 56 > 2 > 437 - 449