@article{JMLR:v10:kang09a,
  author  = {Changsung Kang and Jin Tian},
  title   = {Markov Properties for Linear Causal Models with Correlated Errors},
  journal = {Journal of Machine Learning Research},
  year    = {2009},
  volume  = {10},
  number  = {2},
  pages   = {41--70},
  url     = {http://jmlr.org/papers/v10/kang09a.html}
}