@inproceedings{DBLP:conf/adbt/DilgerZ77,
author = {Werner Dilger and
Gisela Zifonun},
title = {The Predicate Calculus-Language KS as a Query Language},
booktitle = {Logic and Data Bases},
year = {1977},
pages = {377-408},
bibsource = {DBLP, http://dblp.uni-trier.de}
}