@inproceedings{unsupervisedfeaturelearningbycrosslevel,
  title = {Unsupervised Feature Learning by Cross-Level Instance-Group Discrimination},
  author = {Xudong Wang and Ziwei Liu and Stella X. Yu},
  year = {2020},
  booktitle = {CVPR 2021 1},
  eprint = {2008.03813},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2008.03813v5},
}