Extending Logic Programming
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\begin{bibtex} @inproceedings{DBLP:conf/sigmod/LaenensSV90, crossref={DBLP:conf/sigmod/90}, title={Extending Logic Programming}, pages={184-193}, year={1990}, booktitle={SIGMOD Conference}, url={http://www.informatik.uni-trier.de/~ley/db/conf/sigmod/sigmod90.html#LaenensSV90}, ee={http://doi.acm.org/10.1145/93597.98728}, ee={db/conf/sigmod/LaenensSV90.html}, cdrom={SIGMOD90/P184.PDF}, author={Els Laenens and Domenico Saccà and Dirk Vermeir} }\end{bibtex}
