The Complexity of Closed World Reasoning and Circumscription
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\begin{bibtex} @inproceedings{DBLP:conf/aaai/CadoliL90, title={The Complexity of Closed World Reasoning and Circumscription}, pages={550-555}, year={1990}, booktitle={AAAI}, url={http://www.informatik.uni-trier.de/~ley/db/conf/aaai/aaai90.html#CadoliL90}, author={Marco Cadoli and Maurizio Lenzerini} }\end{bibtex}
