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IEEE Transactions on Antennas and Propagation > 2011 > 59 > 1 > 294 - 297
IEEE Antennas and Wireless Propagation Letters > 2010 > 9 > 787 - 790
IEEE Antennas and Wireless Propagation Letters > 2010 > 9 > 608 - 611
IEEE Transactions on Antennas and Propagation > 2008 > 56 > 5 > 1223 - 1228
IET Microwaves, Antennas & Propagation > 2008 > 2 > 1 > 42 - 47