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Electronics Letters > 1993 > 29 > 8 > 682 - 684
IEE Proceedings I - Communications, Speech and Vision > 1992 > 139 > 1 > 58 - 70
Electronics Letters > 1993 > 29 > 8 > 682 - 684
IEE Proceedings I - Communications, Speech and Vision > 1992 > 139 > 1 > 58 - 70