@article{structuringcausaltreemodelswith,
  title = {Structuring Causal Tree Models with Continuous Variables},
  author = {Lei Xu and Judea Pearl},
  year = {2013},
  eprint = {1304.2730},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1304.2730v1},
}