Electronics Letters
Electronics Letters > 1986 > 22 > 9 > 503 - 504
Electronics Letters > 1989 > 25 > 3 > 223 - 224
Electronics Letters > 1990 > 26 > 8 > 515 - 516
Electronics Letters > 1990 > 26 > 17 > 1411 - 1412
Electronics Letters > 1991 > 27 > 23 > 2121 - 2122