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IEEE Transactions on Antennas and Propagation > 2010 > 58 > 2 > 367 - 374
IEEE Antennas and Wireless Propagation Letters > 2003 > 2 > 1 > 133 - 135
IEEE Antennas and Wireless Propagation Letters > 2003 > 2 > 1 > 208 - 211
Electronics Letters > 1992 > 28 > 22 > 2048 - 2049