@inproceedings{zhong2022proqa,
title = {ProQA: Structural Prompt-based Pre-training for Unified Question Answering},
author = {Wanjun Zhong and Yifan Gao and Ning Ding and Yujia Qin and Zhiyuan Liu and Ming Zhou and Jiahai Wang and Jian Yin and Nan Duan},
year = {2022},
booktitle = {North American Chapter of the Association for Computational Linguistics},
eprint = {2205.04040},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2205.04040},
}