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IEEE Antennas and Wireless Propagation Letters > 2017 > 16 > 258 - 261
IEEE Transactions on Antennas and Propagation > 2013 > 61 > 2 > 547 - 554
IEEE Transactions on Antennas and Propagation > 2011 > 59 > 1 > 294 - 297
IEEE Antennas and Wireless Propagation Letters > 2010 > 9 > 1115 - 1118
IEEE Antennas and Wireless Propagation Letters > 2007 > 6 > 21 - 24