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Electronics Letters > 1993 > 29 > 4 > 415 - 417
Electronics Letters > 1991 > 27 > 16 > 1405 - 1407
Electronics Letters > 1989 > 25 > 17 > 1169 - 1171
Electronics Letters > 1993 > 29 > 4 > 415 - 417
Electronics Letters > 1991 > 27 > 16 > 1405 - 1407
Electronics Letters > 1989 > 25 > 17 > 1169 - 1171