@article{unsupervisedpersonreidentificationa,
  title = {Unsupervised Person Re-Identification: A Systematic Survey of Challenges and Solutions},
  author = {Xiangtan Lin and Pengzhen Ren and Chung-Hsing Yeh and Lina Yao and Andy Song and Xiaojun Chang},
  year = {2021},
  eprint = {2109.06057},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2109.06057v2},
}