@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" }