@article{everylwfandampchaingraphoriginatesfrom,
  title = {Every LWF and AMP chain graph originates from a set of causal models},
  author = {Jose M. Peña},
  year = {2013},
  eprint = {1312.2967},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1312.2967v3},
}