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IEEE Transactions on Antennas and Propagation > 2011 > 59 > 1 > 339 - 342
IEEE Transactions on Antennas and Propagation > 2009 > 57 > 4-2 > 1259 - 1263
IEEE Antennas and Wireless Propagation Letters > 2004 > 3 > 1 > 211 - 214
IEEE Antennas and Wireless Propagation Letters > 2003 > 2 > 1 > 130 - 132