1. A connectionist processing metaphor for diagnostic reasoning
2. , , , and , “SIGN: A question answer non-numerical abductive medical expert system,” Proc. of 9th European Meeting on Cybernetics and Systems Research, Vienna, Austria, April 5-8, 1988, pp. 467–473.
3. and , Introduction to Artificial Intelligence, Addison-Wesley, Reading, MA, 1985, Chap. 8.
4. Introduction to Expert Systems, Addison-Wesley, Reading, MA, 1986.