@article{linearpolytreestructuralequationmodels,
  title = {Learning Linear Polytree Structural Equation Models},
  author = {Xingmei Lou and Yu Hu and XiaoDong Li},
  year = {2021},
  eprint = {2107.10955},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2107.10955v4},
}