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IEEE Antennas and Wireless Propagation Letters > 2016 > 15 > 1309 - 1312
IEEE Antennas and Wireless Propagation Letters > 2016 > 15 > 930 - 933
IEEE Transactions on Antennas and Propagation > 2012 > 60 > 4 > 2096 - 2100
IEEE Antennas and Wireless Propagation Letters > 2011 > 10 > 631 - 634