Electronics Letters
Electronics Letters > 1990 > 26 > 8 > 534 - 536
Electronics Letters > 1990 > 26 > 9 > 605 - 607
Electronics Letters > 1990 > 26 > 16 > 1280 - 1282
Electronics Letters > 1990 > 26 > 16 > 1245 - 1246
Electronics Letters > 1990 > 26 > 24 > 2049 - 2050