Electronics Letters
Electronics Letters > 1989 > 25 > 4 > 277 - 278
Electronics Letters > 1990 > 26 > 19 > 1628 - 1629
Electronics Letters > 1991 > 27 > 5 > 457 - 458
Electronics Letters > 1991 > 27 > 15 > 1374 - 1376
Electronics Letters > 1991 > 27 > 19 > 1720 - 1722