@inproceedings{qaitclassifyingnonreferentialitfor,
  title = {QA-It: Classifying Non-Referential It for Question Answer Pairs},
  author = {Timothy Lee and Alex Lutz and Jinho D. Choi},
  year = {2016},
  booktitle = {ACL 2016 8},
  url = {https://aclanthology.org/P16-3020},
}