Electronics Letters
Electronics Letters > 1990 > 26 > 14 > 1061 - 1063
Electronics Letters > 1990 > 26 > 23 > 1977 - 1978
Electronics Letters > 1991 > 27 > 5 > 428 - 430
Electronics Letters > 1991 > 27 > 25 > 2391 - 2393
Electronics Letters > 1993 > 29 > 19 > 1725 - 1726