@article{detectinggroupedlocalaveragetreatment,
  title = {Detecting Grouped Local Average Treatment Effects and Selecting True Instruments},
  author = {Nicolas Apfel and Helmut Farbmacher and Rebecca Groh and Martin Huber and Henrika Langen},
  year = {2022},
  eprint = {2207.04481},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2207.04481v2},
}