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IEEE Antennas and Wireless Propagation Letters > 2015 > 14 > 293 - 296
IEEE Transactions on Microwave Theory and Techniques > 2010 > 58 > 4 > 757 - 763
IEEE Antennas and Wireless Propagation Letters > 2009 > 8 > 1087 - 1090
IEEE Antennas and Wireless Propagation Letters > 2007 > 6 > 627 - 630
IEEE Antennas and Wireless Propagation Letters > 2004 > 3 > 1 > 265 - 268