The Representation of Defaults in Cyc
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\begin{bibtex} @inproceedings{DBLP:conf/aaai/Guha90, title={The Representation of Defaults in Cyc}, pages={608-614}, year={1990}, booktitle={AAAI}, url={http://www.informatik.uni-trier.de/~ley/db/conf/aaai/aaai90.html#Guha90}, author={Ramanathan V. Guha} }\end{bibtex}
