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IEEE Antennas and Wireless Propagation Letters > 2016 > 15 > 44 - 47
IEEE Transactions on Antennas and Propagation > 2014 > 62 > 11 > 5485 - 5496
IEEE Antennas and Wireless Propagation Letters > 2009 > 8 > 935 - 938
IEEE Antennas and Wireless Propagation Letters > 2009 > 8 > 100 - 103