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IEEE Transactions on Antennas and Propagation > 2015 > 63 > 12 > 5382 - 5390
IEEE Antennas and Wireless Propagation Letters > 2015 > 14 > 666 - 669
IEEE Transactions on Antennas and Propagation > 2014 > 62 > 7 > 3890 - 3893
IEEE Transactions on Antennas and Propagation > 2013 > 61 > 7 > 3905 - 3908