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IEEE Transactions on Antennas and Propagation > 2015 > 63 > 11 > 5245 - 5250
IEEE Transactions on Antennas and Propagation > 2013 > 61 > 10 > 5274 - 5278
IEEE Antennas and Wireless Propagation Letters > 2010 > 9 > 330 - 333
IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control > 2002 > 49 > 5 > 558 - 564