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IEEE Transactions on Antennas and Propagation > 2006 > 54 > 9 > 2679 - 2682
Electronics Letters > 1990 > 26 > 11 > 705 - 707
IEEE Transactions on Antennas and Propagation > 2006 > 54 > 9 > 2679 - 2682
Electronics Letters > 1990 > 26 > 11 > 705 - 707