@inproceedings{squad2crsemisupervisedannotationfor,
  title = {SQuAD2-CR: Semi-supervised Annotation for Cause and Rationales for Unanswerability in SQuAD 2.0},
  author = {Gyeongbok Lee and Seung-won Hwang and Hyunsouk Cho},
  year = {2020},
  booktitle = {LREC 2020 5},
  url = {https://aclanthology.org/2020.lrec-1.667},
}