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IEEE Transactions on Microwave Theory and Techniques > 2017 > 65 > 7 > 2353 - 2360
IEEE Antennas and Wireless Propagation Letters > 2017 > 16 > 2675 - 2678
IEEE Transactions on Microwave Theory and Techniques > 2016 > 64 > 10 > 3244 - 3254