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Electronics Letters > 2015 > 51 > 18 > 1400 - 1402
IEEE Transactions on Antennas and Propagation > 2015 > 63 > 9 > 4194 - 4198
IEEE Transactions on Antennas and Propagation > 2015 > 63 > 8 > 3362 - 3370
IEEE Transactions on Antennas and Propagation > 2015 > 63 > 7 > 2843 - 2850
IEEE Transactions on Antennas and Propagation > 2015 > 63 > 5 > 1917 - 1924