Short Time Periods

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\begin{bibtex} @inproceedings{DBLP:conf/ijcai/HayesA87, title={Short Time Periods}, pages={981-983}, year={1987}, booktitle={IJCAI}, url={http://www.informatik.uni-trier.de/~ley/db/conf/ijcai/ijcai87.html#HayesA87}, author={Patrick J. Hayes and James F. Allen} }\end{bibtex}