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Electronics Letters > 1992 > 28 > 9 > 839 - 841
IEE Proceedings I - Communications, Speech and Vision > 1992 > 139 > 1 > 91 - 94
Electronics Letters > 1992 > 28 > 9 > 839 - 841
IEE Proceedings I - Communications, Speech and Vision > 1992 > 139 > 1 > 91 - 94