@article{philipgwrightdirectedacyclicgraphsand,
  title = {Philip G. Wright, directed acyclic graphs, and instrumental variables},
  author = {Jaap H. Abbring and Victor Chernozhukov and Iván Fernández-Val},
  year = {2025},
  eprint = {2501.16395},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2501.16395v2},
}