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IEEE Transactions on Microwave Theory and Techniques > 2017 > 65 > 11-1 > 4418 - 4427
IEEE Antennas and Wireless Propagation Letters > 2017 > 16 > 2983 - 2986
IEEE Transactions on Antennas and Propagation > 2011 > 59 > 5 > 1769 - 1773
IEEE Antennas and Wireless Propagation Letters > 2009 > 8 > 472 - 474