@article{JMLR:v7:silva06a,
  author  = {Ricardo Silva and Richard Scheine and Clark Glymour and Peter Spirtes},
  title   = {Learning the Structure of Linear Latent Variable Models},
  journal = {Journal of Machine Learning Research},
  year    = {2006},
  volume  = {7},
  number  = {8},
  pages   = {191--246},
  url     = {http://jmlr.org/papers/v7/silva06a.html}
}