@article{unsuperviseddomainadaptationforsparse,
  title = {Unsupervised Domain Adaptation for Sparse Retrieval by Filling Vocabulary and Word Frequency Gaps},
  author = {Hiroki Iida and Naoaki Okazaki},
  year = {2022},
  eprint = {2211.03988},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2211.03988v1},
}