@article{detectingheterogeneoustreatmenteffectwit,
  title = {Detecting Heterogeneous Treatment Effect with Instrumental Variables},
  author = {Michael Johnson and Jiongyi Cao and Hyunseung Kang},
  year = {2019},
  eprint = {1908.03652},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/1908.03652v2},
}