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Electronics Letters > 1991 > 27 > 16 > 1453 - 1454
Electronics Letters > 1989 > 25 > 18 > 1211 - 1212
Electronics Letters > 1989 > 25 > 13 > 861 - 863
Electronics Letters > 1991 > 27 > 16 > 1453 - 1454
Electronics Letters > 1989 > 25 > 18 > 1211 - 1212
Electronics Letters > 1989 > 25 > 13 > 861 - 863