@article{journals/cacm/CeriG86,
  title = "Normalization of Relations and PROLOG",
  author = "Stefano Ceri and Georg Gottlob",
  year = "1986",
  journal = "Commun. {ACM}",
  number = "6",
  pages = "524-544",
  url = "http://www.informatik.uni-trier.de/~ley/db/journals/cacm/CeriG86.html",
  volume = "29",
}