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IEEE Transactions on Antennas and Propagation > 2016 > 64 > 1 > 316 - 321
IEEE Transactions on Antennas and Propagation > 2013 > 61 > 11 > 5807 - 5812
IEEE Transactions on Antennas and Propagation > 2011 > 59 > 4 > 1093 - 1100