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IEEE Transactions on Antennas and Propagation > 2011 > 59 > 4 > 1113 - 1122
IEEE Transactions on Antennas and Propagation > 2011 > 59 > 4 > 1085 - 1092
IEEE Antennas and Wireless Propagation Letters > 2010 > 9 > 501 - 505
IEEE Antennas and Propagation Magazine > 2001 > 43 > 1 > 20 - 30