@Article{HGC95,
  author =	 "D. Heckerman and D. Geiger and D.M. Chickering",
  title =	 "Learning {Bayesian} Networks: The Combination of
                  Knowledge and Statistical Data",
  journal =	 "Machine Learning",
  year =	 1995,
  volume =	 20,
  pages =	 "197-243"
}