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IEEE Antennas and Wireless Propagation Letters > 2014 > 13 > 1437 - 1440
IET Microwaves, Antennas & Propagation > 2008 > 2 > 2 > 180 - 187
IEEE Antennas and Wireless Propagation Letters > 2014 > 13 > 1437 - 1440
IET Microwaves, Antennas & Propagation > 2008 > 2 > 2 > 180 - 187