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IEEE Transactions on Antennas and Propagation > 2011 > 59 > 3 > 1061 - 1065
IEEE Transactions on Antennas and Propagation > 2011 > 59 > 12 > 4853 - 4857
IEEE Transactions on Antennas and Propagation > 2010 > 58 > 10 > 3401 - 3406