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Electronics Letters > 1990 > 26 > 17 > 1378 - 1380
Electronics Letters > 1986 > 22 > 15 > 774 - 775
Electronics Letters > 1984 > 20 > 17 > 685 - 686
Electronics Letters > 1983 > 19 > 16 > 641 - 643
Electronics Letters > 1983 > 19 > 13 > 491 - 493