Things That Change by Themselves

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\begin{bibtex} @inproceedings{DBLP:conf/ijcai/LifschitzR89, title={Things That Change by Themselves}, pages={864-867}, year={1989}, booktitle={IJCAI}, url={http://www.informatik.uni-trier.de/~ley/db/conf/ijcai/ijcai89.html#LifschitzR89}, author={Vladimir Lifschitz and Arkady Rabinov} }\end{bibtex}