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IEEE Antennas and Wireless Propagation Letters > 2010 > 9 > 554 - 557
Electronics Letters > 2008 > 44 > 2 > 73 - 74
IEEE Antennas and Wireless Propagation Letters > 2010 > 9 > 554 - 557
Electronics Letters > 2008 > 44 > 2 > 73 - 74