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Electronics Letters > 1990 > 26 > 25 > 2102 - 2104
IEE Proceedings H - Microwaves, Optics and Antennas > 1982 > 129 > 3 > 123 - 134
Electronics Letters > 1990 > 26 > 25 > 2102 - 2104
IEE Proceedings H - Microwaves, Optics and Antennas > 1982 > 129 > 3 > 123 - 134