Electronics Letters
Electronics Letters > 1986 > 22 > 12 > 679 - 680
Electronics Letters > 1992 > 28 > 5 > 487 - 489
Electronics Letters > 1992 > 28 > 18 > 1729 - 1730
Electronics Letters > 1993 > 29 > 2 > 154 - 156
Electronics Letters > 1993 > 29 > 9 > 805 - 807