@inproceedings{courseconceptexpansioninmoocswith1,
  title = {Course Concept Expansion in MOOCs with External Knowledge and Interactive Game},
  author = {Jifan Yu and Chenyu Wang and Gan Luo and Lei Hou and Juanzi Li and Jie Tang and Zhiyuan Liu},
  year = {2019},
  booktitle = {ACL 2019 7},
  eprint = {1909.07739},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/1909.07739v1},
}