@article{JMLR:v9:shpitser08a,
  author  = {Ilya Shpitser and Judea Pearl},
  title   = {Complete Identification Methods for the Causal Hierarchy},
  journal = {Journal of Machine Learning Research},
  year    = {2008},
  volume  = {9},
  number  = {64},
  pages   = {1941--1979},
  url     = {http://jmlr.org/papers/v9/shpitser08a.html}
}