@article{JMLR:v10:silva09a,
  author  = {Ricardo Silva and Zoubin Ghahramani},
  title   = {The Hidden Life of Latent Variables: Bayesian Learning with Mixed Graph Models},
  journal = {Journal of Machine Learning Research},
  year    = {2009},
  volume  = {10},
  number  = {41},
  pages   = {1187--1238},
  url     = {http://jmlr.org/papers/v10/silva09a.html}
}