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IEEE Transactions on Antennas and Propagation > 2016 > 64 > 12 > 5424 - 5435
IEEE Antennas and Wireless Propagation Letters > 2012 > 11 > 1273 - 1276
IEEE Transactions on Antennas and Propagation > 2007 > 55 > 11-2 > 3326 - 3332