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Electronics Letters > 1993 > 29 > 12 > 1135 - 1136
Electronics Letters > 1991 > 27 > 25 > 2317 - 2318
IEE Proceedings H - Microwaves, Optics and Antennas > 1984 > 131 > 5 > 304 - 308
Electronics Letters > 1982 > 18 > 25 > 1099 - 1100