Electronics Letters
Electronics Letters > 1990 > 26 > 6 > 392 - 393
Electronics Letters > 1991 > 27 > 13 > 1213 - 1215
Electronics Letters > 1991 > 27 > 25 > 2340 - 2341
Electronics Letters > 1993 > 29 > 8 > 724 - 725
Electronics Letters > 1993 > 29 > 21 > 1881 - 1883