@inproceedings{yu-etal-2019-course,
    title = "Course Concept Expansion in {MOOC}s with External Knowledge and Interactive Game",
    author = "Yu, Jifan  and
      Wang, Chenyu  and
      Luo, Gan  and
      Hou, Lei  and
      Li, Juanzi  and
      Liu, Zhiyuan  and
      Tang, Jie",
    editor = "Korhonen, Anna  and
      Traum, David  and
      M{\`a}rquez, Llu{\'i}s",
    booktitle = "Proceedings of the 57th Annual Meeting of the Association for Computational Linguistics",
    month = jul,
    year = "2019",
    address = "Florence, Italy",
    publisher = "Association for Computational Linguistics",
    url = "https://preview.aclanthology.org/jlcl-multiple-ingestion/P19-1421/",
    doi = "10.18653/v1/P19-1421",
    pages = "4292--4302"
}