@article{matchingestimatorswithfewtreatedandmany,
  title = {Matching Estimators with Few Treated and Many Control Observations},
  author = {Bruno Ferman},
  year = {2019},
  eprint = {1909.05093},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/1909.05093v4},
}