@inproceedings{Frommholz/etal:04a,
  author={Ingo Frommholz and Ulrich Thiel and Thomas Kamps},
  title={Annotation-based Document Retrieval with Four-Valued Probabilistic Datalog},
  key={Frommholz/etal:04a},
  booktitle={Proceedings of the first SIGIR Workshop on the Integration of Information Retrieval and Databases (WIRD'04)},
  pages={31--38},
  year=2004,
  editor={Thomas R\"{o}lleke and Arjen P. de Vries},
  address={Sheffield, UK},
  url={http://homepages.cwi.nl/~arjen/wird04/papers/WIRD_Frommholz_etal.pdf}
}