1. The Sciences of the Artificial;Simon,1968
2. C.M. Eastman, Cognitive processes and ill-defined problems: a case study from design, in: International Joint Conferences on Artificial Intelligence ’69, pp. 669–690.
3. The structure of ill structured problems;Simon;Artificial Intelligence,1973
4. Shape grammars and the generative specification of painting and sculpture;Stiny,1972
5. Introduction to shape and shape grammars;Stiny;Environment and Planning B,1980