@article{journals/sigmod/GottlobK04,
  title = "Logic-based Web Information Extraction",
  author = "Georg Gottlob and Christoph Koch",
  year = "2004",
  journal = "{SIGMOD} Record",
  number = "2",
  pages = "87-94",
  url = "http://www.acm.org/sigmod/record/issues/0406/DBPrincipleLeonid-gottlob.pdf",
  volume = "33",
  doi = "10.1145/1024694.1024711",
}