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IEEE Antennas and Wireless Propagation Letters > 2010 > 9 > 554 - 557
IEEE Antennas and Wireless Propagation Letters > 2008 > 7 > 389 - 392
IEEE Antennas and Wireless Propagation Letters > 2010 > 9 > 554 - 557
IEEE Antennas and Wireless Propagation Letters > 2008 > 7 > 389 - 392