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PhD Thesis, Department of Computer Sciences, The University of Texas at Austin. Available as TR AI95-241.

@phdthesis{rajagopalan:phd95, title={Qualitative reasoning about dynamic change in the spatial properties of a physical system}, author={Raman Rajagopalan}, school={Department of Computer Sciences, The University of Texas at Austin}, address={Austin, TX}, note={Available as TR AI95-241}, url="http://www.cs.utexas.edu/users/ai-lab?rajagopalan:phd95", year={1995} }