@InCollection{Chickering96lns,
  author =	 "David Maxwell Chickering",
  title =	 "Learning {Bayesian} Networks is {NP}-{Complete}",
  booktitle =	 "Learning from Data: Artificial Intelligence and
                  Statistics V",
  pages =	 "121-130",
  publisher =	 "Springer-Verlag",
  year =	 1996,
  editor =	 "D. Fisher and H.J. Lenz"
}