@article{whatestimatorsareunbiasedforlinear,
  title = {What Estimators Are Unbiased For Linear Models?},
  author = {Lihua Lei and Jeffrey Wooldridge},
  year = {2022},
  eprint = {2212.14185},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2212.14185v1},
}