Electronics Letters
Electronics Letters > 1989 > 25 > 3 > 223 - 224
Electronics Letters > 1989 > 25 > 23 > 1587 - 1589
Electronics Letters > 1991 > 27 > 8 > 655 - 657
Electronics Letters > 1991 > 27 > 14 > 300 - 301
Electronics Letters > 1991 > 27 > 24 > 2210 - 2211