@article{JMLR:v13:ramsahai12a,
  author  = {Roland R. Ramsahai},
  title   = {Causal Bounds and Observable Constraints for Non-deterministic Models},
  journal = {Journal of Machine Learning Research},
  year    = {2012},
  volume  = {13},
  number  = {29},
  pages   = {829--848},
  url     = {http://jmlr.org/papers/v13/ramsahai12a.html}
}