1. D. Bobrow (ed.),Qualitative Reasoning about Physical Systems, MIT Press, Cambridge, Mass., 1985.
2. J. Bradshaw, “Evaluating Design Using Knowledge of Purpose and Knowledge of Structure”,IEEE Expert, pp. 33–40, IEEE Computer Society, Los Alamitos, CA, April 1991.
3. J. Cagan and A. Agogino, “Inducing Constraint Activity in Innovative Design”,Artificial Intelligence for Engineering Design, Analysis and Manufacturing (AI EDAM), pp. 47–61, vol. 5, no. 1, Academic Press, 1991.
4. J. deKleer and J. Brown, “A Qualitative Physics Based on Confluences”,Qualitative Reasoning About Physical Systems, pp. 7–84, MIT Press, Cambridge, Mass., 1985.
5. J. Dixon, M. Duffey, R. Irani, K. Munier and M. Orelup, “A Proposed Taxonomy of Mechanical Design Problems”, Proceedings of the ASME Computers in Engineering Conference, San Francisco, American Society of Mechanical Engineers, New York, NY, August 1988.