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IEEE Antennas and Wireless Propagation Letters > 2017 > 16 > 3108 - 3112
IEEE Transactions on Antennas and Propagation > 2013 > 61 > 10 > 5200 - 5213
IEEE Transactions on Antennas and Propagation > 2012 > 60 > 9 > 4148 - 4156
IEEE Transactions on Antennas and Propagation > 2008 > 56 > 11 > 3404 - 3410