@inproceedings{yu-etal-2022-coco,
    title = "{COCO}-{DR}: Combating the Distribution Shift in Zero-Shot Dense Retrieval with Contrastive and Distributionally Robust Learning",
    author = "Yu, Yue  and
      Xiong, Chenyan  and
      Sun, Si  and
      Zhang, Chao  and
      Overwijk, Arnold",
    editor = "Goldberg, Yoav  and
      Kozareva, Zornitsa  and
      Zhang, Yue",
    booktitle = "Proceedings of the 2022 Conference on Empirical Methods in Natural Language Processing",
    month = dec,
    year = "2022",
    address = "Abu Dhabi, United Arab Emirates",
    publisher = "Association for Computational Linguistics",
    url = "https://aclanthology.org/2022.emnlp-main.95/",
    doi = "10.18653/v1/2022.emnlp-main.95",
    pages = "1462--1479"
}