@article{journals/tkde/CeriGT89,
  title = "What you Always Wanted to Know About Datalog (And Never Dared to Ask)",
  author = "Stefano Ceri and Georg Gottlob and Letizia Tanca",
  year = "1989",
  journal = "{IEEE Trans. Knowl. Data Eng.}",
  number = "1",
  pages = "146-166",
  url = "http://www.informatik.uni-trier.de/~ley/db/journals/tkde/CeriGT89.html",
  volume = "1",
}