@article{approximatefactormodelswithweaker,
  title = {Approximate Factor Models with Weaker Loadings},
  author = {Jushan Bai and Serena Ng},
  year = {2021},
  eprint = {2109.03773},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2109.03773v4},
}