Electronics Letters
Electronics Letters > 1989 > 25 > 3 > 243 - 244
Electronics Letters > 1989 > 25 > 25 > 1731 - 1732
Electronics Letters > 1991 > 27 > 4 > 340 - 342
Electronics Letters > 1992 > 28 > 9 > 860 - 861
Electronics Letters > 1992 > 28 > 9 > 851 - 853