@inproceedings{buildingalargeannotatedcorpusoflearner,
  title = {Building a Large Annotated Corpus of Learner English: The NUS Corpus of Learner English},
  author = {Daniel Dahlmeier and Hwee Tou Ng and Siew Mei Wu},
  year = {2013},
  booktitle = {WS 2013 6},
  url = {https://aclanthology.org/W13-1703},
}