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IEEE Antennas and Wireless Propagation Letters > 2010 > 9 > 657 - 661
IEEE Transactions on Antennas and Propagation > 2010 > 58 > 1 > 238 - 241
IEEE Antennas and Wireless Propagation Letters > 2009 > 8 > 790 - 793
IEEE Antennas and Wireless Propagation Letters > 2009 > 8 > 509 - 512