@article{heterogeneouscoefficientscontrolvariable,
  title = {Heterogeneous Coefficients, Control Variables, and Identification of Multiple Treatment Effects},
  author = {Whitney K. Newey and Sami Stouli},
  year = {2020},
  eprint = {2009.02314},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2009.02314v3},
}