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A qualitative physics based on confluences


Artificial Intelligence 24:7—83. Reprinted In Hobbs, J. R. and Moore, R. C. (Eds.), Formal Theories of the Commonsense World, chap. 4, pp. 109–183. Ablex.

Qualitative and quantitative knowledge in classical mechanics


Tech. rep. AITR- 352, MIT Artificial Intelligence Laboratory. Reprinted In P. H. Winston and R. H. Brown (editors), Artificial Intelligence: An MIT Perspective, pages S-30. The MIT Press, Cambridge, 1979.