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IEEE Transactions on Antennas and Propagation > 2015 > 63 > 11 > 4715 - 4722
IEEE Transactions on Antennas and Propagation > 2015 > 63 > 11 > 4792 - 4800
IEEE Transactions on Antennas and Propagation > 2014 > 62 > 5 > 2531 - 2542
IEEE Antennas and Wireless Propagation Letters > 2013 > 12 > 265 - 268