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Electronics Letters > 1992 > 28 > 6 > 582 - 584
Electronics Letters > 1992 > 28 > 14 > 1302 - 1303
Electronics Letters > 1986 > 22 > 21 > 1122 - 1123
Electronics Letters > 1986 > 22 > 6 > 343 - 345
IEE Proceedings H - Microwaves, Optics and Antennas > 1983 > 130 > 5 > 363 - 368
Electronics Letters > 1982 > 18 > 8 > 344 - 345
IEE Proceedings H - Microwaves, Optics and Antennas > 1981 > 128 > 6 > 285 - 289