Electronics Letters
Electronics Letters > 1990 > 26 > 21 > 1753 - 1755
Electronics Letters > 1993 > 29 > 8 > 666 - 667
Electronics Letters > 1993 > 29 > 11 > 961 - 963
Electronics Letters > 1993 > 29 > 21 > 1893 - 1894
Electronics Letters > 1993 > 29 > 21 > 1881 - 1883