@article{JMLR:v18:16-166,
  author  = {Santtu Tikka and Juha Karvanen},
  title   = {Simplifying Probabilistic Expressions in Causal Inference},
  journal = {Journal of Machine Learning Research},
  year    = {2017},
  volume  = {18},
  number  = {36},
  pages   = {1--30},
  url     = {http://jmlr.org/papers/v18/16-166.html}
}