Adding Number Restrictions to a Four-Valued Terminological Logic

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\begin{bibtex} @inproceedings{DBLP:conf/aaai/Patel-Schneider88, title={Adding Number Restrictions to a Four-Valued Terminological Logic}, pages={485-490}, year={1988}, booktitle={AAAI}, url={http://www.informatik.uni-trier.de/~ley/db/conf/aaai/aaai88.html#Patel-Schneider88}, author={Peter F. Patel-Schneider} }\end{bibtex}