1. Also in Knowledge Acquisition as Modeling, and , Eds., Wiley, NY, 1993.
2. Viewing knowledge bases as qualitative models
3. “Models and analogy in science,” In The Encyclopedia of Philosophy, Ed., Collier Macmillan, New York, 1967, pp. 354–359.
4. “Varieties of computer—their applications and inter-relationships,” In Proceedings of IFAC Symposium on Pulse Rate and Pulse Number Signals in Automatic Control, Budapest, 1968, Butterworths, London, 1968, pp. 1–16.