@inproceedings{lu-etal-2021-multi,
    title = "Multi-stage Training with Improved Negative Contrast for Neural Passage Retrieval",
    author = "Lu, Jing  and
      Hernandez Abrego, Gustavo  and
      Ma, Ji  and
      Ni, Jianmo  and
      Yang, Yinfei",
    editor = "Moens, Marie-Francine  and
      Huang, Xuanjing  and
      Specia, Lucia  and
      Yih, Scott Wen-tau",
    booktitle = "Proceedings of the 2021 Conference on Empirical Methods in Natural Language Processing",
    month = nov,
    year = "2021",
    address = "Online and Punta Cana, Dominican Republic",
    publisher = "Association for Computational Linguistics",
    url = "https://preview.aclanthology.org/fix-sig-urls/2021.emnlp-main.492/",
    doi = "10.18653/v1/2021.emnlp-main.492",
    pages = "6091--6103"
}