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Electronics Letters > 1993 > 29 > 17 > 1562 - 1563
Electronics Letters > 1992 > 28 > 25 > 2279 - 2280
IEE Proceedings I - Communications, Speech and Vision > 1992 > 139 > 3 > 297 - 302
IEE Proceedings I - Communications, Speech and Vision > 1991 > 138 > 5 > 458 - 464