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IEEE Antennas and Wireless Propagation Letters > 2010 > 9 > 1197 - 1200
IEEE Transactions on Antennas and Propagation > 2010 > 58 > 8 > 2776 - 2781
IEEE Antennas and Wireless Propagation Letters > 2009 > 8 > 375 - 378
IEEE Transactions on Antennas and Propagation > 2008 > 56 > 10 > 3337 - 3341