@article{towardsuniversaldenseretrievalforopen,
  title = {Towards Universal Dense Retrieval for Open-domain Question Answering},
  author = {Christopher Sciavolino},
  year = {2021},
  eprint = {2109.11085},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2109.11085v1},
}