@article{quotientspacebasedkeywordretrievalin,
  title = {Quotient Space-Based Keyword Retrieval in Sponsored Search},
  author = {Yijiang Lian and Shuang Li and Chaobing Feng and Yanfeng Zhu},
  year = {2021},
  eprint = {2105.12371},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2105.12371v1},
}