@InCollection{greenland:pea11,
  pages =	 "208--216, Part 3, {DOI: 10.1007/978-3-642-04898-2_162}",
  author =       "Greenland, S.\ and Pearl, J.",
  title =        "Causal Diagrams",
  editor =	 "M.\ Lovric",
  booktitle =	 "International Encyclopedia of Statistical Science",
  year =	 2011
}