Tractable Concept Languages

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\begin{bibtex} @inproceedings{DBLP:conf/ijcai/DoniniLNN91, title={Tractable Concept Languages}, pages={458-465}, year={1991}, booktitle={IJCAI}, url={http://www.informatik.uni-trier.de/~ley/db/conf/ijcai/ijcai91.html#DoniniLNN91}, author={Francesco M. Donini and Maurizio Lenzerini and Daniele Nardi and Werner Nutt} }\end{bibtex}