@Article{brito:pea02-r291,
  author =       "Brito, C. and Pearl, J",
  title =        "A New Identification Condition for Recursive Models
                  with Correlated Errors",
  journal =      "Journal Structural Equation Modeling",
  year =     2002,
  volume =   "9",
  issue =    "4",
  pages =    "459--474"
}