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IEEE Antennas and Wireless Propagation Letters > 2009 > 8 > 1080 - 1083
IEEE Antennas and Wireless Propagation Letters > 2009 > 8 > 1398 - 1401
IEEE Antennas and Wireless Propagation Letters > 2009 > 8 > 498 - 501
IEEE Antennas and Wireless Propagation Letters > 2008 > 7 > 661 - 664