@inproceedings{qi-etal-2021-hidden,
    title = "Hidden Killer: Invisible Textual Backdoor Attacks with Syntactic Trigger",
    author = "Qi, Fanchao  and
      Li, Mukai  and
      Chen, Yangyi  and
      Zhang, Zhengyan  and
      Liu, Zhiyuan  and
      Wang, Yasheng  and
      Sun, Maosong",
    editor = "Zong, Chengqing  and
      Xia, Fei  and
      Li, Wenjie  and
      Navigli, Roberto",
    booktitle = "Proceedings of the 59th Annual Meeting of the Association for Computational Linguistics and the 11th International Joint Conference on Natural Language Processing (Volume 1: Long Papers)",
    month = aug,
    year = "2021",
    address = "Online",
    publisher = "Association for Computational Linguistics",
    url = "https://preview.aclanthology.org/fix-sig-urls/2021.acl-long.37/",
    doi = "10.18653/v1/2021.acl-long.37",
    pages = "443--453"
}