@inproceedings{DBLP:conf/dexa/LehnerHSM93,
  author    = {Franz Lehner and
               Hubert F. Hofmann and
               Ralf Setzer and
               Ronald Maier},
  title     = {Maintenance of Knowledge Bases},
  booktitle = {DEXA},
  year      = {1993},
  pages     = {436-447},
  ee        = {http://dx.doi.org/10.1007/3-540-57234-1_42},
  crossref  = {DBLP:conf/dexa/1993},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}

@proceedings{DBLP:conf/dexa/1993,
  editor    = {Vladim\'{\i}r Mar\'{\i}k and
               Jir\'{\i} Lazansk{\'y} and
               Roland Wagner},
  title     = {Database and Expert Systems Applications, 4th International
               Conference, DEXA'93, Prague, Czech Republic, September 6-8,
               1993, Proceedings},
  booktitle = {DEXA},
  publisher = {Springer},
  series    = {Lecture Notes in Computer Science},
  volume    = {720},
  year      = {1993},
  isbn      = {3-540-57234-1},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}