@inproceedings{triadconstraintsforlearningcausal,
  title = {Triad Constraints for Learning Causal Structure of Latent Variables},
  author = {Ruichu Cai and Feng Xie and Clark Glymour and Zhifeng Hao and Kun Zhang},
  year = {2019},
  booktitle = {NeurIPS 2019 12},
  url = {http://papers.nips.cc/paper/9448-triad-constraints-for-learning-causal-structure-of-latent-variables},
}