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IEEE Antennas and Propagation Magazine > 2017 > 59 > 2 > 79 - 87
IEEE Antennas and Wireless Propagation Letters > 2012 > 11 > 117 - 120
IEEE Antennas and Wireless Propagation Letters > 2011 > 10 > 115 - 118
IEEE Transactions on Antennas and Propagation > 2009 > 57 > 7 > 1931 - 1935