@article{relationextractionasopenbookexamination,
  title = {Relation Extraction as Open-book Examination: Retrieval-enhanced Prompt Tuning},
  author = {Xiang Chen and Lei LI and Ningyu Zhang and Chuanqi Tan and Fei Huang and Luo Si and Huajun Chen},
  year = {2022},
  eprint = {2205.02355},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2205.02355v2},
}