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IEEE Antennas and Wireless Propagation Letters > 2009 > 8 > 1123 - 1126
IEEE Transactions on Antennas and Propagation > 2009 > 57 > 7 > 2172 - 2175
IEEE Transactions on Antennas and Propagation > 2009 > 57 > 8 > 2464 - 2468
IEEE Transactions on Antennas and Propagation > 2008 > 56 > 5 > 1223 - 1228