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IEEE Transactions on Microwave Theory and Techniques > 2014 > 62 > 5 > 1102 - 1111
IEEE Transactions on Microwave Theory and Techniques > 2013 > 61 > 4 > 1403 - 1413
IEEE Transactions on Antennas and Propagation > 2013 > 61 > 1 > 211 - 220