@article{unobservedgroupedheteroskedasticityand,
  title = {Unobserved Grouped Heteroskedasticity and Fixed Effects},
  author = {Jorge A. Rivero},
  year = {2023},
  eprint = {2310.14068},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2310.14068v2},
}