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Electronics Letters > 1991 > 27 > 2 > 144 - 146
Electronics Letters > 1991 > 27 > 22 > 1997 - 1998
Electronics Letters > 1990 > 26 > 23 > 1975 - 1977
IEEE Transactions on Electron Devices > 1988 > 35 > 12 > 2180 - 2188
IEE Proceedings I Communications, Speech and Vision [see also IEE Proceedings-Communications] > 1983 > 130 > 3 > 144 - 150