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IEEE Antennas and Wireless Propagation Letters > 2017 > 16 > 1871 - 1874
IEEE Antennas and Wireless Propagation Letters > 2015 > 14 > 743 - 746
IEEE Transactions on Antennas and Propagation > 2013 > 61 > 4-2 > 2282 - 2285
IEEE Transactions on Antennas and Propagation > 2011 > 59 > 3 > 725 - 732