@inproceedings{xu-etal-2022-laprador,
    title = "{L}a{P}ra{D}o{R}: Unsupervised Pretrained Dense Retriever for Zero-Shot Text Retrieval",
    author = "Xu, Canwen  and
      Guo, Daya  and
      Duan, Nan  and
      McAuley, Julian",
    editor = "Muresan, Smaranda  and
      Nakov, Preslav  and
      Villavicencio, Aline",
    booktitle = "Findings of the Association for Computational Linguistics: ACL 2022",
    month = may,
    year = "2022",
    address = "Dublin, Ireland",
    publisher = "Association for Computational Linguistics",
    url = "https://preview.aclanthology.org/fix-sig-urls/2022.findings-acl.281/",
    doi = "10.18653/v1/2022.findings-acl.281",
    pages = "3557--3569"
}