@article{tran2020cross,
  title={Cross-lingual retrieval for iterative self-supervised training},
  author={Chau Tran, Yuqing Tang, Xian Li, Jiatao Gu},
  journal={arXiv preprint arXiv:2006.09526},
  url={https://arxiv.org/abs/2006.09526},
  year={2020}
}