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IEEE Antennas and Wireless Propagation Letters > 2009 > 8 > 299 - 302
IEEE Transactions on Antennas and Propagation > 2008 > 56 > 3 > 896 - 899
Electronics Letters > 2008 > 44 > 1 > 9 - 11
IEEE Transactions on Antennas and Propagation > 2008 > 56 > 4 > 1177 - 1180