@inproceedings{ye-etal-2022-robustness, title = "On the Robustness of Question Rewriting Systems to Questions of Varying Hardness", author = "Ye, Hai and Ng, Hwee Tou and Han, Wenjuan", editor = "Muresan, Smaranda and Nakov, Preslav and Villavicencio, Aline", booktitle = "Proceedings of the 60th Annual Meeting of the Association for Computational Linguistics (Volume 1: Long Papers)", month = may, year = "2022", address = "Dublin, Ireland", publisher = "Association for Computational Linguistics", url = "https://preview.aclanthology.org/jlcl-multiple-ingestion/2022.acl-long.149/", doi = "10.18653/v1/2022.acl-long.149", pages = "2100--2113" }