ed. by Nigel Shadbolt.Research and development in expert systems．6：proceedings of expert systems 89, the 9th annual Technical Conference of the British Computer Society Specialist Group on Expert Systems, London, 1989.Cambridge Univ. Pr.,1989.
Research and development in expert systems．6：proceedings of expert systems 89, the 9th annual Technical Conference of the British Computer Society Specialist Group on Expert Systems, London, 1989
