Electronics Letters
Electronics Letters > 1991 > 27 > 17 > 1521 - 1523
Electronics Letters > 1991 > 27 > 17 > 1588 - 1590
Electronics Letters > 1992 > 28 > 8 > 771 - 773
Electronics Letters > 1992 > 28 > 12 > 1165 - 1167
Electronics Letters > 1992 > 28 > 25 > 2359 - 2360