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IEEE Antennas and Wireless Propagation Letters > 2017 > 16 > 856 - 859
IEEE Access > 2017 > 5 > 14657 - 14663
IEEE Transactions on Antennas and Propagation > 2016 > 64 > 10 > 4477 - 4481
IEEE Antennas and Wireless Propagation Letters > 2016 > 15 > 950 - 953