@inproceedings{liu-etal-2021-domain,
    title = "Domain-Lifelong Learning for Dialogue State Tracking via Knowledge Preservation Networks",
    author = "Liu, Qingbin  and
      Cao, Pengfei  and
      Liu, Cao  and
      Chen, Jiansong  and
      Cai, Xunliang  and
      Yang, Fan  and
      He, Shizhu  and
      Liu, Kang  and
      Zhao, Jun",
    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.176/",
    doi = "10.18653/v1/2021.emnlp-main.176",
    pages = "2301--2311"
}