@inproceedings{qi-etal-2021-onion,
    title = "{ONION}: A Simple and Effective Defense Against Textual Backdoor Attacks",
    author = "Qi, Fanchao  and
      Chen, Yangyi  and
      Li, Mukai  and
      Yao, Yuan  and
      Liu, Zhiyuan  and
      Sun, Maosong",
    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.752/",
    doi = "10.18653/v1/2021.emnlp-main.752",
    pages = "9558--9566"
}