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IEEE Antennas and Wireless Propagation Letters > 2017 > 16 > 2726 - 2729
IEEE Transactions on Antennas and Propagation > 2015 > 63 > 4-1 > 1334 - 1341
IEEE Transactions on Electron Devices > 2013 > 60 > 3 > 1251 - 1256
IEEE Transactions on Antennas and Propagation > 2010 > 58 > 5 > 1486 - 1493