@inproceedings{difficultyawaredistractorgenerationfor,
  title = {Difficulty-aware Distractor Generation for Gap-Fill Items},
  author = {Chak Yan Yeung and John Lee and Benjamin Tsou},
  year = {2019},
  booktitle = {ALTA 2019 4},
  url = {https://aclanthology.org/U19-1021},
}