@article{discoveringancestralinstrumentalvariable,
  title = {Discovering Ancestral Instrumental Variables for Causal Inference from Observational Data},
  author = {Debo Cheng and Jiuyong Li and Lin Liu and Kui Yu and Thuc Duy Lee and Jixue Liu},
  year = {2022},
  eprint = {2206.01931},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2206.01931v1},
}