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IEEE Transactions on Antennas and Propagation > 2016 > 64 > 9 > 4138 - 4143
IEEE Transactions on Microwave Theory and Techniques > 2011 > 59 > 4-1 > 857 - 865
IEEE Antennas and Wireless Propagation Letters > 2010 > 9 > 1209 - 1212
IEEE Transactions on Antennas and Propagation > 2008 > 56 > 9 > 2875 - 2883