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IEEE Transactions on Antennas and Propagation > 2013 > 61 > 2 > 516 - 523
IEEE Transactions on Antennas and Propagation > 2012 > 60 > 3 > 1592 - 1595
IEEE Transactions on Antennas and Propagation > 2008 > 56 > 3 > 900 - 903
IEEE Antennas and Wireless Propagation Letters > 2007 > 6 > 309 - 312