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IEEE Antennas and Wireless Propagation Letters > 2007 > 6 > 623 - 626
IET Microwaves, Antennas & Propagation > 2007 > 1 > 5 > 980 - 985
IEEE Antennas and Wireless Propagation Letters > 2007 > 6 > 623 - 626
IET Microwaves, Antennas & Propagation > 2007 > 1 > 5 > 980 - 985