@article{JMLR:v7:roverato06a,
  author  = {Alberto Roverato and Milan Studený},
  title   = {A Graphical Representation of Equivalence Classes of AMP Chain Graphs},
  journal = {Journal of Machine Learning Research},
  year    = {2006},
  volume  = {7},
  number  = {38},
  pages   = {1045--1078},
  url     = {http://jmlr.org/papers/v7/roverato06a.html}
}