Electronics Letters
Electronics Letters > 1989 > 25 > 22 > 1529 - 1530
Electronics Letters > 1990 > 26 > 14 > 964 - 965
Electronics Letters > 1990 > 26 > 18 > 1506 - 1508
Electronics Letters > 1993 > 29 > 16 > 1489 - 1491
Electronics Letters > 1993 > 29 > 21 > 1890 - 1891