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IEEE Antennas and Wireless Propagation Letters > 2013 > 12 > 1484 - 1487
IEEE Antennas and Wireless Propagation Letters > 2012 > 11 > 752 - 755
IEEE Transactions on Antennas and Propagation > 2011 > 59 > 5 > 1724 - 1727
IEEE Antennas and Wireless Propagation Letters > 2011 > 10 > 1389 - 1392