Electronics Letters
Electronics Letters > 1991 > 27 > 9 > 757 - 759
Electronics Letters > 1992 > 28 > 9 > 875 - 876
Electronics Letters > 1993 > 29 > 13 > 1225 - 1226
Electronics Letters > 1993 > 29 > 15 > 1313 - 1314
Electronics Letters > 1993 > 29 > 24 > 2136 - 2137