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IEEE Antennas and Wireless Propagation Letters > 2016 > 15 > 1309 - 1312
IEEE Antennas and Wireless Propagation Letters > 2014 > 13 > 1057 - 1060
IEEE Transactions on Antennas and Propagation > 2012 > 60 > 12 > 5564 - 5570
IEEE Antennas and Wireless Propagation Letters > 2002 > 1 > 1 > 57 - 59