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IEEE Transactions on Antennas and Propagation > 2014 > 62 > 6 > 3212 - 3221
IEEE Transactions on Antennas and Propagation > 2010 > 58 > 5 > 1559 - 1566
IEEE Transactions on Microwave Theory and Techniques > 2009 > 57 > 11 > 2775 - 2782